B156C
Extension Module Disconnected
B156C is an OBD-II diagnostic trouble code meaning: Extension Module Disconnected. Common causes: broken or damaged wiring harness (harness) to the expansion module, malfunction of the expansion module itself. Estimated repair cost: $56–167.
Symptoms
- The airbag light is on
- No reaction of additional airbags in an accident
- The error is stored in the ECU memory
Causes
- Broken or damaged wiring harness (harness) to the expansion module
- Malfunction of the expansion module itself
- Poor contact in module connectors
- Problems with power supply or module ground
- ECU software error
How to Fix
- Conduct a visual inspection of the wiring harness and module connectors
- Check the integrity of the wires and the quality of the contacts
- Measure the supply voltage and ground on the module
- Scan the system for other errors
- If necessary, replace the expansion module or restore the connection
- Reset the error and check for its reappearance
Related codes
FAQ
What does the B156C code mean?
B156C is an OBD-II diagnostic trouble code that indicates: Extension Module Disconnected
What causes a B156C error code?
The most common causes of B156C include: Broken or damaged wiring harness (harness) to the expansion module; Malfunction of the expansion module itself; Poor contact in module connectors; Problems with power supply or module ground.
How do I fix a B156C diagnostic trouble code?
To fix B156C: Conduct a visual inspection of the wiring harness and module connectors. Check the integrity of the wires and the quality of the contacts. Measure the supply voltage and ground on the module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B156C?
Do not drive — repair immediately
How much does it cost to fix B156C?
The estimated repair cost for B156C is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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