P2104
PowertrainElectronic Throttlecritical severityThrottle Actuator Control System Forced Idle
What P2104 Means
ECM has forced the engine to idle speed only due to a detected throttle control fault.
Symptoms
- Engine stuck at idle
- Check engine light
- Vehicle barely moves
- Traction control light on
Common Causes
- Throttle body failure
- APP sensor fault
- Wiring issue
- ECM detected conflicting throttle signals
Diagnostic Steps
- Scan for other DTCs
- Check APP sensor signals
- Inspect throttle body
- Clear codes and test
Where to start: Diagnose root cause from accompanying DTCs. This is a protective measure.
🔌 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.
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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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Related Codes
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