Body · Severity: Moderate
B1000 — ECU Internal Failure
A body/control module has detected an internal fault in its own processor, memory or supply.
Common symptoms
- Warning light on dash
- Intermittent electrical functions
- Module not responding to scan tool
Likely causes
- Poor module ground or supply
- Low battery voltage during start
- Water ingress in the module
- Internal module failure
First test to run
Measure supply and ground at the module connector under load (voltage drop below 0.2 V on the ground) before condemning the module.
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