U0112
NetworkPcm Communicationhigh severityLost Communication With ECM/PCM A
What U0112 Means
A module has lost communication with the engine/powertrain control module over the data bus. This usually points to a wiring or bus fault, or a failed control module.
Symptoms
- Engine stalls or won't start
- Multiple warning lights on dash
- Poor or no engine performance
Common Causes
- Faulty CAN bus wiring or connectors
- Corroded or loose grounds
- Failed ECM/PCM
- Blown fuse or power supply issue
Diagnostic Steps
- Scan all modules for stored codes
- Check ECM/PCM power and ground circuits
- Inspect CAN bus wiring for damage
- Test bus voltages and terminate resistance
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
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SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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