B1342 Code: ECU Is Defective
🟠 Moderate severity · drivable
Drivable, but the body control module is failing, which can cause various electrical faults.
What B1342 means
The body control module has detected that it (or a related module) is defective. This is an internal module fault rather than a sensor or wiring problem.
Symptoms
- Check engine light or body-control warning on
- Electrical accessories acting up
- Intermittent faults
- Possible no-start
Common causes
- most common: Faulty body control module
- common: Poor grounds or low battery voltage
- less common: Corroded module connector
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Check battery voltage and module grounds | Yes | $0–50 |
| Replace or reprogram the body control module | Mechanic | $300–1000 |
Frequently asked questions
Can I drive with a B1342 code?
Usually yes, but expect possible electrical faults. Get the module diagnosed soon.
What is the most common cause of B1342?
A failing body control module.
How much does it cost to fix a B1342?
Typically $300–$1,000 for a replacement body control module, including programming.
Related codes
Related guide: The 10 Most Common Check Engine Codes →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.