PCM Mismatch With SKIM
Table of contents
B1A29 JEEP Possible Causes
- Faulty Wireless Control Module (WCM)
- Faulty Powertrain Control Module (PCM)
How do I fix code B1A29 JEEP?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B1A29 JEEP code
The cost of diagnosing the B1A29 JEEP code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B1A29 JEEP Description
For the engine to start, the Sentry Key Immobilizer (SKIM) feature of the Radio Frequency Hub (RF Hub) and the Powertrain Control Module (PCM) must successfully communicate data over the data bus. Once the RF Hub sends the message that a valid Fob-Integrated-Key (FOBIK) is being used, the PCM and RF Hub perform a handshake routine, encrypted with the VIN, to validate this information, and a match allows the engine to run when the ignition state transitions to Start or a remote start occurrence. The repair of this fault is determined by the ability of the RF Hub and PCM to complete a successful handshake routine over the bus. Whenever a valid FOBIK is in the vehicle and the ignition is turned to the ON position or a valid remote start is active, the RF Hub/PCM handshake takes place. The RF Hub validates that the message is sent to, and received by the PCM.
When a valid FOBIK is used and the RF Hub receives a mismatching cryptology code from the PCM as part of the routine, the RF Hub will send the command to flash the Security warning lamp and set this Diagnostic Trouble Code (DTC) as active. The engine will not start and the DTC will remain active until the RF Hub and PCM complete a successful handshake.