Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Jeep Grand Cherokee TrackhawkFACTORY OEM SERVICE PROCEDURE
Module, Air Suspension Control (ASCM)
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| C151E-11 | LEFT FRONT RIDE HEIGHT SENSOR - CIRCUIT SHORT TO GROUND |
| C151E-15 | LEFT FRONT RIDE HEIGHT SENSOR - CIRCUIT SHORT TO BATTERY OR OPEN |
| C151E-36 | LEFT FRONT RIDE HEIGHT SENSOR-SIGNAL FREQUENCY TOO LOW |
| C151E-37 | LEFT FRONT RIDE HEIGHT SENSOR-SIGNAL FREQUENCY TOO HIGH |
| C151E-76 | LEFT FRONT RIDE HEIGHT SENSOR - WRONG MOUNTING POSITION |
| C1522-11 | RIGHT FRONT RIDE HEIGHT SENSOR - CIRCUIT SHORT TO GROUND |
| C1522-15 | RIGHT FRONT RIDE HEIGHT SENSOR - CIRCUIT SHORT TO BATTERY OR OPEN |
| C1522-36 | RIGHT FRONT RIDE HEIGHT SENSOR-SIGNAL FREQUENCY TOO LOW |
| C1522-37 | RIGHT FRONT RIDE HEIGHT SENSOR-SIGNAL FREQUENCY TOO HIGH |
| C1522-76 | RIGHT FRONT RIDE HEIGHT SENSOR - WRONG MOUNTING POSITION |
| C1526-11 | LEFT REAR RIDE HEIGHT SENSOR - CIRCUIT SHORT TO GROUND |
| C1526-15 | LEFT REAR RIDE HEIGHT SENSOR - CIRCUIT SHORT TO BATTERY OR OPEN |
| C1526-36 | LEFT REAR RIDE HEIGHT SENSOR-SIGNAL FREQUENCY TOO LOW |
| C1526-37 | LEFT REAR RIDE HEIGHT SENSOR-SIGNAL FREQUENCY TOO HIGH |
| C1526-76 | LEFT REAR RIDE HEIGHT SENSOR - WRONG MOUNTING POSITION |
| C152A-11 | RIGHT REAR RIDE HEIGHT SENSOR - CIRCUIT SHORT TO GROUND |
| C152A-15 | RIGHT REAR RIDE HEIGHT SENSOR - CIRCUIT SHORT TO BATTERY OR OPEN |
| C152A-36 | RIGHT REAR RIDE HEIGHT SENSOR-SIGNAL FREQUENCY TOO LOW |
| C152A-37 | RIGHT REAR RIDE HEIGHT SENSOR-SIGNAL FREQUENCY TOO HIGH |
| C152A-76 | RIGHT REAR RIDE HEIGHT SENSOR - WRONG MOUNTING POSITION |
| C153A-11 | LEFT FRONT RIDE HEIGHT LEVEL CONTROL - CIRCUIT SHORT TO GROUND |
| C153A-12 | LEFT FRONT RIDE HEIGHT LEVEL CONTROL - CIRCUIT SHORT TO BATTERY |
| C153A-13 | LEFT FRONT RIDE HEIGHT LEVEL CONTROL - CIRCUIT OPEN |
| C153A-96 | LEFT FRONT RIDE HEIGHT LEVEL CONTROL - COMPONENT INTERNAL FAILURE |
| C153D-11 | RIGHT FRONT RIDE HEIGHT LEVEL CONTROL - CIRCUIT SHORT TO GROUND |
| C153D-12 | RIGHT FRONT RIDE HEIGHT LEVEL CONTROL - CIRCUIT SHORT TO BATTERY |
| C153D-13 | RIGHT FRONT RIDE HEIGHT LEVEL CONTROL - CIRCUIT OPEN |
| C153D-96 | RIGHT FRONT RIDE HEIGHT LEVEL CONTROL - COMPONENT INTERNAL FAILURE |
| C1540-11 | LEFT REAR RIDE HEIGHT LEVEL CONTROL - CIRCUIT SHORT TO GROUND |
| C1540-12 | LEFT REAR RIDE HEIGHT LEVEL CONTROL - CIRCUIT SHORT TO BATTERY |
| C1540-13 | LEFT REAR RIDE HEIGHT LEVEL CONTROL - CIRCUIT OPEN |
| C1540-96 | LEFT REAR RIDE HEIGHT LEVEL CONTROL - COMPONENT INTERNAL FAILURE |
| C1543-11 | RIGHT REAR RIDE HEIGHT LEVEL CONTROL - CIRCUIT SHORT TO GROUND |
| C1543-12 | RIGHT REAR RIDE HEIGHT LEVEL CONTROL - CIRCUIT SHORT TO BATTERY |
| C1543-13 | RIGHT REAR RIDE HEIGHT LEVEL CONTROL - CIRCUIT OPEN |
| C1543-96 | RIGHT REAR RIDE HEIGHT LEVEL CONTROL - COMPONENT INTERNAL FAILURE |
| C1556-12 | RIDE HEIGHT AIR PRESSURE SENSOR - CIRCUIT SHORT TO BATTERY |
| C1556-14 | RIDE HEIGHT AIR PRESSURE SENSOR - CIRCUIT SHORT TO GROUND OR OPEN |
| C1556-96 | RIDE HEIGHT AIR PRESSURE SENSOR - COMPONENT INTERNAL FAILURE |
| C155E-11 | RIDE HEIGHT PRESSURE VENT CONTROL - CIRCUIT SHORT TO GROUND |
| C155E-12 | RIDE HEIGHT PRESSURE VENT CONTROL - CIRCUIT SHORT TO BATTERY |
| C155E-13 | RIDE HEIGHT PRESSURE VENT CONTROL - CIRCUIT OPEN |
| C155E-92 | RIDE HEIGHT PRESSURE VENT CONTROL - PERFORMANCE OR INCORRECT OPERATION (OVERUSE DTC) |
| C155E-96 | RIDE HEIGHT PRESSURE VENT CONTROL - COMPONENT INTERNAL FAILURE |
| C1562-13 | RIDE HEIGHT AIR PUMP CONTROL - CIRCUIT OPEN |
| C1562-92 | RIDE HEIGHT AIR PUMP CONTROL - PERFORMANCE OR INCORRECT OPERATION (OVERUSE DTC) |
| C1562-98 | RIDE HEIGHT AIR PUMP CONTROL - COMPONENT OR SYSTEM OVER TEMPERATURE (OVERUSE DTC) |
| C1566-92 | LEFT REAR RIDE HEIGHT LEVEL PERFORMANCE - PERFORMANCE OR INCORRECT OPERATION (OVERUSE DTC) |
| C1567-92 | RIGHT REAR RIDE HEIGHT LEVEL PERFORMANCE - PERFORMANCE OR INCORRECT OPERATION (OVERUSE DTC) |
| C1568-92 | LEFT FRONT RIDE HEIGHT LEVEL PERFORMANCE - PERFORMANCE OR INCORRECT OPERATION (OVERUSE DTC) |
| C1569-92 | RIGHT FRONT RIDE HEIGHT LEVEL PERFORMANCE - PERFORMANCE OR INCORRECT OPERATION (OVERUSE DTC) |
| C156E-00 | RIDE HEIGHT SYSTEM CALIBRATION PERFORMANCE |
| C159E-11 | AIR PUMP TEMPERATURE SENSOR - CIRCUIT SHORT TO GROUND |
| C159E-15 | AIR PUMP TEMPERATURE SENSOR - CIRCUIT SHORT TO BATTERY OR OPEN |
| C159F-11 | AIR SUSPENSION REVERSE VALVE 1 CONTROL - CIRCUIT SHORT TO GROUND |
| C159F-12 | AIR SUSPENSION REVERSE VALVE 1 CONTROL - CIRCUIT SHORT TO BATTERY |
| C159F-13 | AIR SUSPENSION REVERSE VALVE 1 CONTROL - CIRCUIT OPEN |
| C159F-92 | AIR SUSPENSION REVERSE VALVE 1 CONTROL - PERFORMANCE OR INCORRECT OPERATION (OVERUSE DTC) |
| C159F-96 | AIR SUSPENSION REVERSE VALVE 1 CONTROL - COMPONENT INTERNAL FAILURE |
| C15A0-11 | AIR SUSPENSION REVERSE VALVE 2 CONTROL - CIRCUIT SHORT TO GROUND |
| C15A0-12 | AIR SUSPENSION REVERSE VALVE 2 CONTROL - CIRCUIT SHORT TO BATTERY |
| C15A0-13 | AIR SUSPENSION REVERSE VALVE 2 CONTROL - CIRCUIT OPEN |
| C15A0-92 | AIR SUSPENSION REVERSE VALVE 2 CONTROL - PERFORMANCE OR INCORRECT OPERATION (OVERUSE DTC) |
| C15A0-96 | AIR SUSPENSION REVERSE VALVE 2 CONTROL - COMPONENT INTERNAL FAILURE |
| C15A1-00 | UNABLE TO OBTAIN DESIRED RIDE HEIGHT |
| C15A2-00 | RIDE HEIGHT SYSTEM UNLEVEL |
| C15A3-00 | RIDE HEIGHT SYSTEM MANUALLY SWITCH OFF |
| C15A7-2A | AIR SUSPENSION UP BUTTON - STUCK |
| C15A8-2A | AIR SUSPENSION DOWN BUTTON - STUCK |
| C15A9-00 | HEIGHT SENSOR MECHANICAL PERFORMANCE |
| C15AA-00 | AIR LEAK DURING VENT |
| C15AB-00 | AIR LEAK DURING FILL |
| C15AD-92 | RIDE HEIGHT SYSTEM - PERFORMANCE OR INCORRECT OPERATION |
| C15AE-00 | COMPRESSOR PRESSURE LINE LEAK |
| C15AF-1F | LOW SIDE DRIVER - CIRCUIT INTERMITTENT |
| C15C0-98 | AIR SUSPENSION - COMPONENT OR SYSTEM OVER TEMPERATURE (OVERUSE DTC) |
| C15D9-00 | LOW AIR MASS |
| C2110-11 | SENSOR SUPPLY 1 VOLTAGE - CIRCUIT SHORT TO GROUND |
| C2110-12 | SENSOR SUPPLY 1 VOLTAGE - CIRCUIT SHORT TO BATTERY |
| C211B-92 | IGNITION RUN/START INPUT CIRCUIT PERFORMANCE - PERFORMANCE OR INCORRECT OPERATION |
| C2125-11 | SENSOR SUPPLY 2 VOLTAGE - CIRCUIT SHORT TO GROUND |
| C2125-12 | SENSOR SUPPLY 2 VOLTAGE - CIRCUIT SHORT TO BATTERY |
| C2129-16 | BATTERY VOLTAGE - CIRCUIT VOLTAGE BELOW THRESHOLD |
| C2129-17 | BATTERY VOLTAGE - CIRCUIT VOLTAGE ABOVE THRESHOLD |
| C212A-16 | SYSTEM VOLTAGE LOW - CIRCUIT VOLTAGE BELOW THRESHOLD |
| C212A-17 | SYSTEM VOLTAGE HIGH - CIRCUIT VOLTAGE ABOVE THRESHOLD |
| C212B-11 | SENSOR SUPPLY 3 VOLTAGE - CIRCUIT SHORT TO GROUND |
| C212B-12 | SENSOR SUPPLY 3 VOLTAGE - CIRCUIT SHORT TO BATTERY |
| C212C-11 | SUSPENSION VALVE POWER SUPPLY VOLTAGE - CIRCUIT SHORT TO GROUND |
| C212C-12 | SUSPENSION VALVE POWER SUPPLY VOLTAGE - CIRCUIT SHORT TO BATTERY |
| C2202-00 | ORIGINAL VIN MISMATCH / MISSING |
| C2206-00 | VEHICLE CONFIGURATION MISMATCH |
| C220C-00 | ACTIVE SUSPENSION MODULE INTERNAL |
| C2212-00 | ECU IN - PLANT MODE |
| U0001-00 | CAN C BUS |
| U0100-00 | LOST COMMUNICATION WITH ECM/PCM |
| U0101-00 | LOST COMMUNICATION WITH TCM |
| U0102-00 | LOST COMMUNICATION WITH TRANSFER CASE CONTROL MODULE / AWD |
| U0121-00 | LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE |
| U0127-00 | LOST COMMUNICATION WITH TIRE PRESSURE MONITOR MODULE |
| U0140-00 | LOST COMMUNICATION WITH BODY CONTROL MODULE |
| U0155-00 | LOST COMMUNICATION WITH CLUSTER-CCN |
| U0159-00 | LOST COMMUNICATION WITH PARKING ASSIST CONTROL MODULE (PAM) |
| U0212-00 | LOST COMMUNICATION WITH STEERING COLUMN CONTROL MODULE |
| U0401-00 | IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM |
| U0402-00 | IMPLAUSIBLE DATA RECEIVED FROM TCM |
| U0403-00 | IMPLAUSIBLE DATA RECEIVED FROM T-CASE |
| U0415-00 | IMPLAUSIBLE DATA RECEIVED FROM ABS |
| U0422-00 | IMPLAUSIBLE DATA RECEIVED FROM BODY CONTROL MODULE |
| U0423-00 | IMPLAUSIBLE DATA RECEIVED FROM CLUSTER/CCN |
| U0429-00 | IMPLAUSIBLE DATA RECEIVED FROM SCM |
| U045A-00 | IMPLAUSIBLE DATA RECEIVED FROM PARKING ASSIST MODULE |
| U110A-00 | LOST COMMUNICATION WITH SCM - CAN-C |
| U11B9-00 | LOST COMMUNICATION WITH RF HUB |
| U1489-00 | IMPLAUSIBLE DATA RECEIVED FROM RF HUB |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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