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.

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HOMESERVICE MANUALSJEEP2024GRAND CHEROKEE L LIMITED, RWDREPAIR AND DIAGNOSISSUSPENSIONSUSPENSION CONTROL SYSTEMSAIR SUSPENSION CONTROL MODULE (ASCM) - DTCS C008E-00 TO C1522-37DTC TROUBLESHOOTINGC151E-15-LEFT FRONT RIDE HEIGHT SENSOR - CIRCUIT SHORT TO BATTERY OR OPENDIAGNOSTIC TEST

2024 Jeep Grand Cherokee L Limited, RWD

Diagnostic Test

2024 Jeep Grand Cherokee L Limited, RWDSECTION Diagnostic Test

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the ASCM INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE ASCM INTERMITTENT CONDITION .
CHECK THE LEFT FRONT RIDE HEIGHT SENSOR HARNESS CONNECTOR AND AIR SUSPENSION MODULE CONNECTOR FOR DAMAGED, LOOSE, OR DISCONNECTED CONNECTOR
1. Turn the ignition off to the lock position.
2. Check the Left Front Ride Height Sensor for disconnected, damaged, or loose harness connector.
3. Check the Air Suspension Module Connector for disconnected, damaged, or loose harness connector.
4. If any problems were found, Repair the concern.
5. With the scan tool, erase all DTCs.
6. With the scan tool, read DTCs.
  Did the DTC Return?
  
  Yes
  - Go to 3
  No
  - Repair complete.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ASCM VERIFICATION TEST .
ISOLATE THE ASCM CONNECTOR AND LEFT FRONT RIDE HEIGHT SENSOR CONNECTOR AND CHECK FOR A SHORT TO VOLTAGE AT THE LEFT FRONT RIDE HEIGHT SENSOR CONNECTOR.
NOTE:
Disregard any Stored DTCs that may be set while disconnecting and reconnecting any of the harness connectors.
1. Turn the ignition off.
2. Disconnect the ASCM harness connector and Ride Height Sensor Connector. Note: Use the wiring diagram as a guide to follow the path of the circuit.
3. Turn the ignition on.
4. Using a DVOM, measure for voltage at all the Ride Height Sensor connector terminals.
  Is any Voltage present at the circuit?
  
  No
  - Go To 4
  Yes
  - Repair the circuit for short to battery.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ASCM VERIFICATION TEST .
ISOLATE AND CHECK THE (S141) LEFT FRONT HEIGHT SENSOR RETURN CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. The ignition must be off when checking the continuity of a circuit.
2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connector containing the circuit being tested. Note: Use the wiring diagram as a guide to follow the path of the circuit.
3. Before measuring the resistance of any circuit, first measure the resistance between the two leads of the DVOM. Note: The meter leads can add resistance to the measurement value.
4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.
  NOTE:
  When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals.
  
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the circuit for an open or high resistance.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ASCM VERIFICATION TEST .
ISOLATE AND CHECK THE (S142) LEFT FRONT HEIGHT SENSOR SIGNAL FOR AN OPEN OR HIGH RESISTANCE
1. The ignition must be off when checking the continuity of a circuit.
2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connector containing the circuit being tested. Note: Use the wiring diagram as a guide to follow the path of the circuit.
3. Before measuring the resistance of any circuit, first measure the resistance between the two leads of the DVOM. Note: The meter leads can add resistance to the measurement value.
4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.
  NOTE:
  When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals.
  
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the circuit for an open or high resistance.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ASCM VERIFICATION TEST .
ISOLATE AND CHECK THE (S142) LEFT FRONT RIDE HEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT AT THE ASCM HARNESS CONNECTOR
1. The ignition must be off when performing a resistance check to find a short between circuits.
2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and every component harness connector containing the circuit being tested. At this time leave all in-line connectors connected. Note: Use the wiring diagram as a guide to follow the path of the circuit.
3. Connect one lead of the DVOM to the circuit being tested at the ECU harness connector.
4. With the other lead of the DVOM probe all other circuits at the ECU harness connector.
  NOTE:
  When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals.

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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.