DESCRIPTION:Mismatch in jake brake solenoid request controller area network matrix between motor control module and common powertrain controller. Reprogram motor control module (MCM) and common powertrain controller (CPC) with the latest software release. NOTE: Program the MCM2.1 and CPC4 with the latest software release.

NOTE: Reprogram Motor Control Module (MCM) with the latest software version.

NOTE: This fault usually occurs after reprogramming the motor control module (MCM) after reprogramming, all fault codes must be cleared. Use the diagnostic service tool to set engine serial number/Vehicle Identification Number (ESN/VIN), command to change the ESN/VIN in the electronic control modules when you replace any of them, or if the engine is exchanged. NOTE: After programming the MCM, this code could falsly appear. Clear it and see if it returns. If it does, you need to change the VIN # I nthe engine ECM.

NOTE: Internal Motor Control Module (MCM) hardware defect. Replace (Engine ECM).

DESCRIPTION:Exhaust gas recirculatin (EGR) valve actuator, error. MONITORED PARAMETER:EGR valve actuator. TYPICAL ENABLING CONDITIONS:EGR valve actuator internal self test at start up. MONITOR SEQUENCE:None EXECUTION FREQUENCY:Continuous when enabling conditiosn met. TYPICAL DURATION:Two seconds DASH LAMPS:1. MIL2. CEL ENGINE REACTION:Derate 25% NOTE: If code 168-1 present, fix that first. PROBABLE CAUSES:1. Cranking and/or charging system of the truck.2. EGR valve actuator pull rod.3. Inspect for exhaust leaks around the EGR valve, repair as needed.4. EGR valve failure.5. Wiring between EGR valve and ECM.