What does it mean?
U1010 is a Network (CAN bus, module communications) fault code. It indicates: Invalid Internal Control Module Monitoring Data Received From SOBDMC .
Symptoms
- Warning lamps or messages on the cluster, often more than one at a time
- Reduced power or a restricted operating mode until the fault is cleared
- Scan tool shows the module present but with implausible or frozen live data
- Related communication codes stored in other modules
- Intermittent behaviour that follows low voltage or a cold start
- No obvious mechanical symptom, since the fault is a data plausibility failure
Likely causes
- Internal fault inside the secondary on-board diagnostic control module
- Software or calibration mismatch between that module and the rest of the network after a replacement or update
- Low system voltage disturbing module self-tests during cranking or with a weak battery
- Corroded or loose connector at the module, allowing corrupted data frames
- Damaged bus wiring between the module and the gateway, including a broken twist or damaged shield
- Poor ground for the module, which can distort its internal monitoring results
- Another related fault in the system that module supervises, reported through invalid monitoring data
How to fix it
- Record all codes from every module and note which of them are current and which are historic, so the first failing module can be identified
- Test the battery and charging system, then clear all codes and see which return with good voltage
- Inspect and reseat the connector at the module, checking for pushed-out pins, corrosion and moisture
- Check the module's power feeds and ground with a voltage drop test rather than a simple continuity check
- Verify the software and calibration level of the module matches what the vehicle requires
- Inspect the bus wiring between the module and the gateway for damage, poor repairs and untwisted sections
- Reprogram the module if a valid update exists, then clear the code and road test
- Replace the module last, only when supply, ground, wiring and software have all been proven good