P0629: Control Module / Internal Processor Fault

P0629 on the Mercedes Sprinter VS30 falls under the control module / internal processor fault group for the OM642 V6 diesel. The ECU sets this code when it detects an out-of-range condition in this system. Use the symptoms, common causes, and diagnostic steps below as a starting point, and always read the live data and freeze-frame for this specific code before replacing parts. If you're searching for the P0629 Mercedes Sprinter fix or P0629 VS30 / OM642 information, start with a full scan to capture any related codes stored at the same time.

• Check engine light
• Multiple unrelated codes appearing together
• Erratic operation or limp mode
• Possible communication faults between modules

• Control module internal fault
• Software/calibration issue (may need update)
• Power supply or ground fault to the module
• Corroded module connector

1. 1Scan and record all modules and codes.
2. 2Check the module's power and ground supplies.
3. 3Inspect the module connector for corrosion or damage.
4. 4Check for available software/calibration updates from the dealer.
5. 5If the module fails internal tests, it requires replacement and coding by a specialist.

1. 1Apply any available software/calibration update from the dealer.
2. 2Repair the module's power supply or ground fault.
3. 3Clean or repair a corroded module connector.
4. 4Replace and code the control module if it fails internal tests.