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 MANUALSJEEP2023GRAND CHEROKEE SUMMIT 4XEREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOLLISION/AVOIDANCECENTRAL ADAS DECISION MODULE (CADM) - LOW LEVEL - DTCS U01C0-00 TO U1600-00DTC TROUBLESHOOTINGU04C1-00 INVALID DATA RECEIVED FROM FRONT RADAR MODULE "C"DIAGNOSTIC TEST

2023 Jeep Grand Cherokee Summit 4xe

Diagnostic Test

2023 Jeep Grand Cherokee Summit 4xeSECTION Diagnostic Test

CHECK FOR ANY SERVICE BULLETINS OR MODULE SOFTWARE UPDATES
1. Check for any applicable Service Bulletins or Flash updates related to the DTC.
  Are there any applicable Service Bulletins or Flash updates?
  
  Yes
  - Make the applicable repair.
  - Perform the CENTRAL ADAS DECISION MODULE (CADM) - LOW LEVEL - VERIFICATION TEST. Refer to CENTRAL ADAS DECISION MODULE (CADM) - LOW LEVEL - VERIFICATION TEST .
  No
  - Go To 2
READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE 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, 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 3
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FOR OTHER FRONT RIGHT MID RANGE RADAR DTCS
1. Turn to the recorded DTCs.
  Are there any other Front Right Mid Range Radar DTCs present?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to: CENTRAL ADAS DECISION MODULE (CADM) - LOW LEVEL - DIAGNOSTIC CODE INDEX .
  No
  - Go To 4
CHECK RELATED HARNESS CONNECTIONS - ERASE DTCS AND CHECK FOR DTC TO RETURN
1. Turn the ignition off.
2. Disconnect all CADM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all CADM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Turn the ignition off for a minimum of 10 seconds.
11. Turn the ignition on.
12. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
13. With the scan tool, read CADM DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Central ADAS Decision Module (CADM) in accordance with the Service Information. Refer to MODULES, REMOVAL AND INSTALLATION .
  - Perform the CENTRAL ADAS DECISION MODULE (CADM) - LOW LEVEL - VERIFICATION TEST. Refer to CENTRAL ADAS DECISION MODULE (CADM) - LOW LEVEL - VERIFICATION TEST .
  No
  - Repairing the wiring or the connectors corrected the condition.
  - Perform the CENTRAL ADAS DECISION MODULE (CADM) - LOW LEVEL - VERIFICATION TEST. Refer to CENTRAL ADAS DECISION MODULE (CADM) - LOW LEVEL - VERIFICATION TEST .

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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.