2018 Jeep Wrangler
Mileage
64,770
Service Date
9/1/2023
Services Performed
- start stop "engage"? also when off Code PCM code now Customer replaced battery and PCM Jeep dealer did PCM now they're saying the belt and tensioner is the problem Code Scan: Engine P0688
- ASD/Main Sense Circuit B23BB
- Stop/Start Disable Switch 1 Circuit Open B23BF
- Stop/Start Disable Switch 2 Circuit Open U0594
- Implausible Data Received From HCP P152A
- Engine Hood Switch Ajar While Driving P152F
- Engine Hood Switch 2 / Engine Hood Switch 1 Correlation Transmission P1DB6-00
- Vehicle Speed Signal Performance P215C-00
- Output Shaft Speed – Wheel Speed Correlation U0120-00
- Lost Communication With Starter/Generator Control Module Body Control Module (BCM) U0184-00
- Lost Communication With Radio U0002-00
- CAN C Bus Off Performance B16FB-15
- Front Right Fog Lamp Control – Circuit Short to Battery or Open B16F7-15
- Front Left Fog Lamp Control – Circuit Short to Battery or Open Heat Ventilation A/C (HVAC) U11B8-00
- Lost Communication With Integrated Center Stack (ICS) U0184-00
- Lost Communication With Radio Hybrid Control Processor (HCP) P0A92-00
- Hybrid Generator Performance P1AC6-00
- Motor Control Processor A (MCPA) Crankshaft Position Signal Sensor Performance P1AC7-00
- Crankshaft Position Signal Sensor Performance P1C64-00
- Hybrid Performance – Engine Speed Below Target During Autostart P1D54-00
- Internal Control Module Start/Stop System Error U0001-00
- CAN C Bus Integrated Center Stack (ICS) U0184-00
- Lost Communication With Radio Tire Pressure Monitor (TPM) U0485-00
- Implausible Data Received From Radio Lots of aftermarket add-ons noted. Pedal commander (disconnected) aftermarket center display that is on the CAN network, OBDII wireless device on port, and a OBDII "tap" device sending data to something else that cannot be seen. Disconnected the OBDII tap, cleared faults and pulled codes again. Body Control Module (BCM) U0184-00
- Lost Communication With Radio Hybrid Control Processor (HCP) P0A92-00
- Hybrid Generator Performance P1AC6-00
- Motor Control Processor A (MCPA) Crankshaft Position Signal Sensor Performance Tire Pressure Monitor (TPM) U0485-00
- Implausible Data Received From Radio OBDII Codes ($03) P0A92
- Hybrid Generator Performance OBDII Permanent Codes ($0A) P1C64
- Manufacturer Specific P1AC7
- Manufacturer Specific P0A92
- Hybrid Generator Performance P1AC6
- Manufacturer Specific Hybrid processor/motor/generator seem to be the main current issue and faults with the MGU can result in low system voltages as described by the customer. The P0A92-00
- Hybrid Generator Performance fault code resets without the engine even being started. This code is set by two possibilities: 1) The MGU belt is slipping or otherwise failing. 2) ANY other HCP fault codes. The first step in the diag of this code is to check for other HCP codes, In this case the only other code is P1AC6-00
- Motor Control Processor A (MCPA) Crankshaft Position Signal Sensor Performance which sets as soon as engine is started. The MGU (which contains the HCP) uses the crank sensor data from the PCM fed over a dedicated comm circuit between the PCM and MGU. Diag routine for this fault states that if there is no crank sensor fault codes in the PCM that the fault must lay in the dedicated comm circuit or in the MGU/HCP itself. Visually inspected the harnesses and connections between PCM and MGU for obvious faults, no issues found. The next step is to perform circuit testing of the comm circuits which will take additional time to perform due to limited access to the MGU connector. If circuit fault is found will need to locate and repair. If no circuit fault is found the MGU will require replacement. New MGU will require full module programming procedure. Also advise to replace the MGU tensioner and belt at the same time. Need about 2 more hours to perform accurate system circuit tests.
- Removed RF wheel well to gain access to the MGU and harness. Tested resistance on the crank position comm circuit at the MGU with the corresponding pi
Alan R. gave our service a 5 star review on 9/2/2023
