B1342 B0xxx · Body (B) Medium severity
ECU Internal Fault / Memory Error (Body Module)
The body module flagged an internal memory or processor error. Like all internal-fault codes, external power problems come first on the list.
Severity guidance: Medium — drivability or emissions affected, book it in this week
Symptoms you will notice
- Body functions erratic
- Module not responding
- Configuration lost
Common causes
Ordered from most to least likely — start at the top.
- 1 Power supply irregularities
- 2 Water ingress
- 3 Corrupted configuration
- 4 True internal failure
How to diagnose it
Cheapest and least invasive first — most of these codes are not a parts problem.
- ✓ Verify supply and earth integrity first.
- ✓ Inspect for water ingress around the module and connectors.
- ✓ Attempt a reconfigure or reflash with professional tooling.
- ✓ Replace the module only after the above fails.
Repair options
- Fix supply/water ingress and reflash
- Replace and code the module if genuinely failed
B1342 — frequently asked questions
Does a replacement module need coding? +
Almost always. Fitting a used or blank module without coding usually leaves more faults than it fixes.
Is this code manufacturer-specific? +
Yes above B1000. Always cross-check the definition for your marque.
Confirm the diagnosis before you buy parts
Send us the code, freeze-frame data and the vehicle — our engineers will tell you what to test first.