If you're looking for help fixing your Mercury Automobile, look no further! Our comprehensive Mercury Automobile error code guide will explain common issues, provide tips, and show you how to read your model's error codes.

P1000  
OBD System Readiness Test Not Complete 

P1001  
KOER Test Cannot Be Completed 

P1039  
Vehicle Speed Signal Missing or Improper 

P1051  
Brake Switch Signal Missing or Improper 

P1100  
Mass Air Flow Sensor Intermittent 

P1101  
Mass Air Flow Sensor Out of Self-Test Range 

P1105  
Dual Alternator Upper Fault 

P1106  
Dual Alternator Lower Fault/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage 

P1107  
Dual Alternator Lower Circuit Malfunction/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage 

P1108  
Dual Alternator Battery Lamp Circuit Malfunction 

P1109  
IAT - B Sensor Intermittent 

P1111  
System Pass 

P1112  
Intake Air Temperature Sensor Intermittent 

P1114  
Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage/IAT - B Circuit Low Input 

P1115  
Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage/IAT - B Circuit High Input 

P1116  
Engine Coolant Temperature Sensor is Out of Self-Test Range 

P1117  
Engine Coolant Temperature Sensor Intermittent 

P1118  
Manifold Absolute Temperature Circuit Low Input 

P1119  
Manifold Absolute Temperature Circuit High Input 

P1120  
Throttle Position Sensor Out of Range 

P1121  
Throttle Position Sensor Inconsistent with Mass Air Flow Sensor 

P1122  
Throttle Position (TP) Sensor Circuit Intermittent Low Voltage 

P1123  
Throttle Position Sensor In Range But Higher Than Expected 

P1124  
Throttle Position Sensor Out of Self-Test Range 

P1125  
Throttle Position Sensor Intermittent 

P1127  
Exhaust Not Warm Enough - Downstream O2 Sensor Not Tested - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1128  
Upstream Heated Oxygen Sensor Signals Reversed - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1129  
Downstream Heated Oxygen Sensor Signals Reversed - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1130  
Lack of Upstream Heated Oxygen Sensor Switch - Adaptive Fuel Limit - Bank 1 - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1131  
Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 1 - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1132  
Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank 1 - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1133  
Bank 1 Fuel Control Shifted Lean - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1134  
Bank 1 Fuel Control Shifted Rich - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1135  
Pedal Position Sensor A Circuit Intermittent 

P1137  
Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 1 - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1138  
Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank 1 - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1139  
Water In Fuel Indicator Circuit Malfunction 

P1140  
Water In Fuel Condition 

P1141  
Fuel Restriction Indicator Circuit Malfunction 

P1142  
Fuel Restriction Condition 

P1150  
Lack of Upstream Heated Oxygen Sensor Switch - Adaptive Fuel Limit - Bank 2 - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1151  
Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 2 - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1152  
Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank 2 - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1153  
Bank 2 Fuel Control Shifted Lean - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1154  
Bank 2 Fuel Control Shifted Rich - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1155  
Alternative Fuel Controller 

P1157  
Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 2 - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1158  
Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank 2 - Read Our Article on Oxygen Sensor Codes For Help With This Mercury Check Engine Light Code 

P1168  
Fuel Rail Sensor In-Range Low Failure 

P1169  
Fuel Rail Sensor In-Range High Failure 

P1170  
ESO - Engine Shut Off Solenoid Fault 

P1171  
Rotor Sensor Fault 

P1172  
Rotor Control Fault 

P1173  
Rotor Calibration Fault 

P1174  
Cam Sensor Fault 

P1175  
Cam Control Fault 

P1176  
Cam Calibration Fault 

P1177  
Synchronization Fault 

P1180  
Fuel Delivery System Malfunction - Low 

P1181  
Fuel Delivery System Malfunction - High 

P1183  
Engine Oil Temperature Circuit Malfunction 

P1184  
Engine Oil Temperature Out Of Self Test Range 

P1185  
FTS High - Fuel Pump Temperature Sensor High 

P1186  
FTS Low - Fuel Pump Temperature Sensor Low 

P1187  
Variant Selection 

P1188  
Calibration Memory Fault 

P1189  
Pump Speed Signal Fault 

P1190  
Calibration Resistor Out Of Range 

P1191  
Key Line Voltage 

P1192  
Voltage External 

P1193  
EGR Drive Overcurrent 

P1194  
ECU A/D Converter 

P1195  
SCP HBCC Failed To Initialize 

P1196  
Key Off Voltage High 

P1197  
Key Off Voltage Low 

P1198  
Pump Rotor Control Under fueling 

P1209  
Injector Control Pressure System Fault 

P1210  
Injector Control Pressure Above Expected Level 

P1211  
Injector Control Pressure Sensor Above / Below Desired 

P1212  
Injector Control Pressure Not Detected During Crank 

P1213  
Start Injector Circuit Malfunction 

P1214  
Pedal Position Sensor B Circuit Intermittent 

P1215  
Pedal Position Sensor C Circuit Low Input 

P1216  
Pedal Position Sensor C Circuit High Input 

P1217  
Pedal Position Sensor C Circuit Intermittent 

P1218  
CID High 

P1219  
CID Low 

P1220  
Series Throttle Control Fault 

P1221  
Traction Control System Malfunction 

P1222  
Traction Control Output Circuit Malfunction 

P1223  
Pedal Demand Sensor B Circuit High Input 

P1224  
Throttle Position Sensor B Out of Self-Test Range 

P1227  
Wastegate Failed Closed (Over Pressure) 

P1228  
Wastegate Failed Open (Under Pressure) 

P1229  
Intercooler Pump Driver Fault 

P1230  
Open Power to Fuel Pump Circuit 

P1231  
High Speed Fuel Pump Relay Activated 

P1232  
Low Speed Fuel Pump Primary Circuit Failure 

P1233  
Fuel Pump Driver Module Off-Line 

P1234  
Fuel Pump Driver Module Off-Line 

P1235  
Fuel Pump Control Out of Range 

P1236  
Fuel Pump Control Out of Range 

P1237  
Fuel Pump Secondary Circuit Fault 

P1238  
Fuel Pump Secondary Circuit Fault 

P1239  
Speed Fuel Pump Positive Feed Fault 

P1243  
Second Fuel Pump Faulty or Ground Fault 

P1244  
Alternator Load Input Failed High 

P1245  
Alternator Load Input Failed Low 

P1246  
Alternator Load Input Failed 

P1247  
Turbo Boost Pressure Low 

P1248  
Turbo Boost Pressure Not Detected 

P1249  
Wastegate Control Valve Performance 

P1250  
Lack of Power to FPRC Solenoid 

P1252  
Pedal Correlation PDS1 and LPDS High 

P1253  
Pedal Correlation PDS1 and LPDS Low 

P1254  
Pedal Correlation PDS2 and LPDS High 

P1255  
Pedal Correlation PDS2 and LPDS Low 

P1256  
Pedal Correlation PDS1 and HPDS 

P1257  
Pedal Correlation PDS2 and HPDS 

P1258  
Pedal Correlation PDS1 and PDS2 

P1260  
Theft Detected - Engine Disabled 

P1261  
Cylinder #1 High To Low Side Short 

P1262  
Cylinder #2 High To Low Side Short 

P1263  
Cylinder #3 High To Low Side Short 

P1264  
Cylinder #4 High To Low Side Short 

P1265  
Cylinder #5 High To Low Side Short 

P1266  
Cylinder #6 High To Low Side Short 

P1267  
Cylinder #7 High To Low Side Short 

P1268  
Cylinder #8 High To Low Side Short 

P1270  
Engine RPM or Vehicle Speed Limiter Reached 

P1270  
Engine RPM Or Speed Limiter Reached 

P1271  
Cylinder #1 High To Low Side Open 

P1272  
Cylinder #2 High To Low Side Open 

P1273  
Cylinder #3 High To Low Side Open 

P1274  
Cylinder #4 High To Low Side Open 

P1275  
Cylinder #5 High To Low Side Open 

P1276  
Cylinder #6 High To Low Side Open 

P1277  
Cylinder #7 High To Low Side Open 

P1278  
Cylinder #8 High To Low Side Open 

P1280  
Injection Control Pressure Out Of Range Low 

P1281  
Injection Control Pressure Out Of Range High 

P1282  
Excessive Injection Control Pressure 

P1283  
IPR Circuit Failure 

P1284  
Aborted KOER - ICP Failure 

P1285  
Cylinder head over temp sensed 

P1286  
Fuel Pulse In Range But Lower Than Expected 

P1287  
Fuel Pulse In Range But Higher Than Expected 

P1288  
Cylinder Head Temperature Sensor Out of Self-Test Range 

P1289  
Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range 

P1290  
Cylinder Head Temperature Sensor Signal Less Than Self-Test Range 

P1291  
Injector High Side Short To GND Or VBATT - Bank 1 

P1292  
Injector High Side Short To GND Or VBATT - Bank 2 

P1293  
Injector High Side Open - Bank 1 

P1294  
Injector High Side Open - Bank 2/Target idle not reached 

P1295  
Multi-faults - Bank 1 - With Low Side Shorts 

P1296  
Multi-faults - Bank 2 - With Low Side Shorts 

P1297  
Injector High Sides Shorted Together 

P1298  
IDM Failure 

P1299  
Cylinder Head Temperature Sensor Detected Engine Overheating Condition 

P1300  
Boost Calibration Fault 

P1301  
Boost Calibration High 

P1302  
Boost Calibration Low 

P1303  
EGR Calibration Fault - Read Our Article on EGR Valve Codes For Help With This Mercury Check Engine Light Code 

P1304  
EGR Calibration High 

P1305  
EGR Calibration Low 

P1306  
Kickdown Relay Pull - In Circuit Fault 

P1307  
Kickdown Relay Hold Circuit Fault 

P1308  
A/C Clutch Circuit Fault 

P1309  
Misfire Detection Monitor Not enabled 

P1316  
Injector Circuit / IDM Codes Detected 

P1317  
Injector Circuit / IDM Codes Not Updated 

P1340  
Camshaft Position Sensor B Circuit Malfunction 

P1351  
Ignition Diagnostic Monitor Circuit Input Fault 

P1352  
Ignition Coil A - Primary Circuit Fault 

P1353  
Ignition Coil B - Primary Circuit Fault 

P1354  
Ignition Coil C - Primary Circuit Fault 

P1355  
Ignition Coil D - Primary Circuit Fault 

P1356  
Loss of Ignition Diagnostic Module Input to PCM 

P1357  
Ignition Diagnostic Monitor Pulse width Not Defined 

P1358  
Ignition Diagnostic Monitor Signal Out of Self-Test Range 

P1359  
Spark Output Circuit Fault 

P1360  
Ignition Coil A Secondary Circuit Malfunction 

P1361  
Ignition Control (IC) Circuit Low Voltage 

P1362  
Ignition Coil C Secondary Circuit Malfunction 

P1363  
Ignition Coil D Secondary Circuit Malfunction 

P1364  
Ignition Coil Primary Circuit Fault 

P1365  
Ignition Coil Secondary Circuit Failure 

P1369  
Engine Temperature Light Monitor Failure 

P1380  
VCT Solenoid Valve Circuit Short or Open 

P1381  
Cam Timing Advance is excessive 

P1383  
Cam Timing Advance is excessive 

P1385  
Variable Cam Timing Solenoid B Malfunction 

P1386  
Variable Cam Timing Over advanced (Bank #2) 

P1388  
Variable Cam Timing Over retarded (Bank #2) 

P1389  
Glow Plug Circuit High Side Low Input 

P1390  
Octane Adjust Out of Self-Test Range 

P1391  
Glow Plug Circuit Low Input (Bank #1) 

P1392  
Glow Plug Circuit High Input (Bank #1) 

P1393  
Glow Plug Circuit Low Input (Bank #2) 

P1394  
Glow Plug Circuit High Input (Bank #2) 

P1395  
Glow Plug Monitor Fault (Bank #1) 

P1396  
Glow Plug Monitor Fault (Bank #2) 

P1397  
System Voltage Out Of Self Test Range 

P1399  
Glow Plug Circuit High Side, High Input 

P1400  
Differential Pressure Feedback Electronic Sensor Circuit Low Voltage - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1401  
Differential Pressure Feedback Electronic Sensor Circuit High Voltage - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1402  
EGR Metering Orifice Restricted - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1403  
Differential Pressure Feedback Electronic Sensor Hoses Reversed - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1404  
IAT - B Circuit Malfunction/ Exhaust Gas Recirculation Closed Position Performance 

P1405  
Differential Pressure Feedback Electronic Sensor Circuit Upstream Hose - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1406  
Differential Pressure Feedback Electronic Sensor Circuit Downstream Hose - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1407  
EGR No Flow Detected - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1408  
EGR Flow Out of Self-Test Range - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1409  
EGR Vacuum Regulator Circuit malfunction - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1409  
Electronic Vacuum Regulator Control Circuit Fault - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1410  
EGR Barometric Pressure Sensor VREF Voltage - Read Our Article on EGR System Diagnosis For Help With This Mercury Check Engine Light Code 

P1411  
Secondary Air is Not being diverted 

P1413  
Secondary Air Injection System Monitor Circuit Low Voltage 

P1414  
Secondary Air Injection System Monitor Circuit High Voltage 

P1431  
Misfire Monitor Disabled, Unable to Learn Trigger Wheel Profile 

P1442  
Secondary Air Injection System Monitor Circuit High Voltage 

P1443  
Evaporative Emission Control System - Vacuum System - Purge Control Solenoid or Purge Control Valve Fault 

P1444  
Purge Flow Sensor Circuit Input Low 

P1445  
Purge Flow Sensor Circuit Input High 

P1450  
Inability of Evaporative Emission Control System to Bleed Fuel Tank 

P1451  
EVAP Control System Canister Vent Solenoid Circuit Malfunction 

P1452  
Inability of Evaporative Emission Control System to Bleed Fuel Tank 

P1455  
Substantial Leak or Blockage in Evaporative Emission Control System 

P1457  
Unable To Pull Vacuum In Tank 

P1460  
Wide Open Throttle Air Conditioning Cutoff Circuit malfunction 

P1461  
Air Conditioning Pressure Sensor Circuit Low Input 

P1462  
Air Conditioning Pressure Sensor Circuit high Input 

P1463  
Air Conditioning Pressure Sensor Insufficient Pressure change 

P1464  
ACCS to PCM High During Self-Test 

P1465  
A/C Relay Circuit Malfunction 

P1466  
A/C Refrigerant Temperature Sensor/Circuit Malfunction 

P1469  
Low Air Conditioning Cycling Period 

P1473  
Fan Secondary High with Fans Off 

P1474  
Low Fan Control Primary Circuit 

P1479  
High Fan Control Primary Circuit 

P1480  
Fan Secondary Low with Low Fans On 

P1481  
Fan Secondary Low with High Fans On 

P1482  
SCP 

P1483  
Power to Cooling Fan Exceeded Normal Draw 

P1484  
Variable Load Control Module Pin 1 Open 

P1485  
EGRV Circuit Malfunction 

P1500  
Vehicle Speed Sensor Intermittent 

P1501  
Programmable Speedometer & Odometer Module/Vehicle Speed Sensor Intermittent Circuit-failure 

P1502  
Invalid or Missing Vehicle Speed Message or Brake Data 

P1504  
Intake Air Control Circuit malfunction 

P1505  
Idle Air Control System at Adaptive Clip 

P1506  
Idle Air Control Over Speed Error 

P1507  
Idle Air Control Under Speed Error 

P1512  
Intake Manifold Runner Control Stuck Closed 

P1513  
Intake Manifold Runner Control Stuck Closed 

P1516  
Intake Manifold Runner Control Input Error 

P1517  
Intake Manifold Runner Control Input Error 

P1518  
Intake Manifold Runner Control Fault - Stuck Open 

P1519  
Intake Manifold Runner Control Stuck Open 

P1520  
Intake Manifold Runner Control Circuit Fault 

P1519  
Intake Manifold Runner Control Fault - Stuck Closed 

P1520  
Intake Manifold Runner Control Fault 

P1530  
Open or Short to A/C Compressor Clutch Circuit 

P1531  
Invalid Test - Accelerator Pedal Movement 

P1532  
IMCC Circuit Malfunction, Bank B 

P1533  
AAI Circuit Malfunction 

P1534  
Inertia Switch Activated 

P1536  
Parking Brake Switch Circuit Failure 

P1537  
Intake Manifold Runner Control Stuck Open 

P1538  
Intake Manifold Runner Control Stuck Open 

P1539  
Power to A/C Compressor Clutch Circuit Exceeded Normal Current Draw 

P1549  
Intake Manifold Temperature Valve Vacuum Actuator Connection 

P1550  
Power Steering Pressure Sensor Out of Self-Test Range 

P1565  
Speed Control Command Switch Out of Range High 

P1566  
Speed Control Command Switch Out of Range Low 

P1567  
Speed Control Output Circuit Continuity 

P1568  
Speed Control Unable to Hold Speed 

P1572  
Brake Pedal Switch Circuit Malfunction 

P1573  
Throttle Position Not Available 

P1574  
Throttle Position Sensor Disagreement between Sensors 

P1575  
Pedal Position Out of Self Test Range 

P1576  
Pedal Position Not Available 

P1577  
Pedal Position Sensor Disagreement between Sensors 

P1578  
ETC Power Less Than Demand 

P1579  
ETC In Power Limiting Mode 

P1580  
Electronic Throttle Monitor PCM Override 

P1581  
Electronic Throttle Monitor Malfunction 

P1582  
Electronic Throttle Monitor Data Available 

P1583  
Electronic Throttle Monitor Cruise Disable 

P1584  
Throttle Control Detected ETB Malfunction 

P1585  
Throttle Control Unit Malfunction 

P1586  
Throttle Control Unit Throttle Position Malfunction 

P1587  
Throttle Control Unit Modulated Command Malfunction 

P1588  
Throttle Control Unit Detected Loss of Return Spring 

P1589  
Throttle Control Unit Unable To Control Desired Throttle Angle 

P1600  
Loss of KAM Power - Open Circuit 

P1605  
PCM Keep Alive Memory Test Error 

P1625  
Voltage to Vehicle Load Control Module Fan Circuit Not detected 

P1626  
Voltage to Vehicle Load Control Module Circuit Not detected 

P1634  
Data Output Link Circuit Failure 

P1635  
Tire / Axle Ratio Out of Acceptable Range 

P1636  
Inductive Signature Chip Communication Error 

P1639  
Vehicle ID Block Corrupted or Not Programmed 

P1640  
Powertrain DTCs Available in Another Module 

P1641  
Fuel Pump Primary Circuit Failure 

P1642  
Fuel Pump Monitor Circuit High Input 

P1643  
Fuel Pump Monitor Circuit Low Input 

P1644  
Fuel Pump Speed Control Circuit Malfunction 

P1650  
Power Steering Pressure Switch Out of Self-Test Range 

P1651  
Power Steering Pressure Switch Input Fault 

P1656  
CAN Link PCM - PCM Circuit - Network 

P1657  
CAN Link Chip Malfunction 

P1660  
Output Circuit Check Signal High 

P1661  
Output Circuit Check Signal Low 

P1662  
IDM_EN Circuit Failure 

P1663  
Fuel Demand Command Signal Circuit Malfunction 

P1667  
CI Circuit Malfunction 

P1668  
PCM - IDM Communications Error 

P1670  
Electronic Feedback Signal Not Detected 

P1690  
Wastegate Solenoid Circuit Malfunction 

P1700  
Transmission system problems 

P1701  
Reverse Engagement Error 

P1702  
Transmission system problems 

P1703  
Brake On/Off Switch Out of Self-Test Range 

P1704  
Transmission system problems 

P1705  
Manual Lever Position Sensor Out of Self-Test Range 

P1706  
High Vehicle Speed Observed in Park 

P1707  
Transfer Case Neutral Indicator Hard Fault Present 

P1709  
Park or Neutral Position Switch Out of Self-Test Range 

P1710  
Transmission system problems 

P1711  
Transmission Fluid Temperature Sensor Out of Self-Test Range 

P1712  
Trans Torque Reduction Request Signal Malfunction 

P1713  
TFT Sensor In Range Failure Low Value 

P1714  
SSA Inductive Signature Malfunction 

P1715  
SSB Inductive Signature Malfunction 

P1716  
SSC Inductive Signature Malfunction 

P1717  
SSD Inductive Signature Malfunction 

P1718  
TFT Sensor In Range Failure High 

P1720  
Vehicle Speed (Meter) Circuit Malfunction 

P1721  
Gear 1 Incorrect Ratio 

P1722  
Gear 2 Incorrect Ratio 

P1723  
Gear 3 incorrect Ratio 

P1724  
Gear 4 Incorrect Ratio 

P1725  
Insufficient Engine Speed Increase During Self Test 

P1726  
Insufficient Engine Speed Decrease During Self Test 

P1727  
Coast Clutch Solenoid Inductive Signature Malfunction 

P1728  
Transmission Slip Error 

P1729  
4x4 Low Switch Error 

P1731  
1-2 Shift Malfunction 

P1732  
2-3 Shift Malfunction 

P1733  
3-4 Shift Malfunction 

P1740  
Transmission system problems 

P1741  
Torque Converter Clutch Control Error 

P1742  
Torque Converter Clutch Solenoid Faulty 

P1743  
Torque Converter Clutch Solenoid Faulty 

P1744  
Torque Converter Clutch System Stuck in Off Position 

P1745  
Transmission system problems 

P1746  
Electronic Pressure Control Solenoid A - Open Circuit 

P1747  
Electronic Pressure Control Solenoid A- Short Circuit 

P1748  
EPC Malfunction 

P1749  
Electronic Pressure Control Solenoid Failed Low 

P1751  
Shift Solenoid A Performance 

P1754  
Coast Clutch Solenoid Circuit malfunction 

P1756  
Shift Solenoid B Performance 

P1760  
Transmission system problems 

P1761  
Shift Solenoid C Performance 

P1762  
Overdrive Band Failed Off 

P1766  
Shift Solenoid D Performance 

P1767  
Torque Converter Clutch Circuit Malfunction 

P1768  
Performance / Normal / Winter Mode Input Malfunction 

P1770  
Clutch Solenoid Circuit Malfunction 

P1779  
Transmission Control Indicator Lamp Circuit Malfunction 

P1780  
Transmission Control Switch Circuit is Out of Self-Test Range 

P1781  
4x4 Low Switch is Out of Self-Test Range 

P1782  
P/ES Circuit Out Of Self Test Range 

P1783  
Transmission Over-Temperature Condition 

P1784  
Transmission Mechanical Failure - First And Reverse 

P1785  
Transmission Mechanical Failure - First And Second 

P1786  
3-2 Downshift Error 

P1787  
2-1 Downshift Error 

P1788  
Pressure Control Solenoid "B" Open Circuit 

P1789  
Pressure Control Solenoid "B" Short Circuit 

P1795  
Idle Switch Circuit Malfunction 

P1804  
Transmission 4-Wheel Drive High Indicator Circuit Failure 

P1806  
Transmission 4-Wheel Drive High Indicator Short Circuit To Battery 

P1808  
Transmission 4-Wheel Drive Low Indicator Circuit Failure 

P1810  
TFP Valve Position Switch Circuit/ Transmission 4-Wheel Drive Low Indicator Short Circuit To Battery 

P1812  
Transmission 4-Wheel Drive Mode Select Circuit Failure 

P1815  
Transmission 4-Wheel Drive Mode Select Short Circuit To Ground 

P1819  
Transmission Neutral Safety Switch Short Circuit To Ground 

P1820  
Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure 

P1822  
Transmission Transfer Case Clockwise Shift Relay Coil Short Circuit To Battery 

P1824  
Transmission 4-Wheel Drive Clutch Relay Circuit Failure 

P1826  
Transmission 4-Wheel Drive Low Clutch Relay Circuit To Battery 

P1828  
Transmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure 

P1830  
Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Battery 

P1832  
Transmission Transfer Case Differential Lock-Up Solenoid Circuit Failure 

P1834  
Transmission Transfer Case Differential Lock-Up Solenoid Short Circuit To Battery 

P1838  
Transmission Transfer Case Shift Motor Circuit Failure 

P1846  
Transmission Transfer Case Contact Plate 'A' Circuit Failure 

P1850  
Transmission Transfer Case Contact Plate 'B' Circuit Failure 

P1854  
Transmission Transfer Case Contact Plate 'C' Circuit Failure 

P1858  
Transmission Transfer Case Contact Plate 'D' Circuit Failure 

P1866  
Transmission Transfer Case System Concern - Servicing Required 

P1867  
Transmission Transfer Case Contact Plate General Circuit Failure 

P1876  
Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure 

P1877  
Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Short To Battery 

P1881  
Engine Coolant Level Switch Circuit Failure, GEM 

P1882  
Engine Coolant Level Switch Circuit Short to Ground 

P1883  
Engine Coolant Level Switch Circuit Failure, GEM 

P1884  
Engine Coolant Level Lamp Circuit Short to Ground 

P1891  
Transmission Transfer Case Contact Plate Ground Return Open Circuit 

P1900  
Output Shaft Speed (OSS) Circuit Intermittent Malfunction 

P1901  
Turbine Shaft Speed (TSS) Circuit Intermittent Malfunction 

P1902  
Kickdown Solenoid Relay Control Circuit 

P1903  
Kickdown Solenoid Circuit Low Voltage 

P1904  
Kickdown Solenoid Circuit High Voltage

SOURCE: https://www.engine-light-help.com/mercury-check-engine-light.html

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