P2154
Fuel Injector Group C Supply Voltage Circuit High
Fuel injector circuit
Generic OBD-II
High
What it means
P2154 means the PCM detected an abnormally high voltage on the supply circuit feeding fuel injector group 'C'. Because that circuit powers a group of injectors, the affected cylinders may not fire correctly, causing misfire, rough running, or hard starting. The usual causes are a wiring short-to-voltage or open, or a faulty injector control/driver module — this is a circuit fault, not a worn part.
High
Can I keep driving? May run rough or misfire on the affected injector group and can be hard to start — drive as little as possible until repaired.
Common symptoms
What you'll notice
- Check-engine light on
- Misfire or rough running from the affected group of cylinders
- Hard starting or possible stalling
- Reduced power / limp mode
Common causes
Most likely first
- Fault in the injector-group supply voltage circuit — short to voltage or an open causing high readingLikely
- Faulty fuel injector control/driver moduleCommon
- Injector supply harness open, shorted, or chafedCommon
- Poor connection or corrosion at the module/injector connectorsLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and visually inspect the injector supply wiring and connectors.
- Check the injector control module (FICM/driver) supply voltage circuit against spec.
- Test the module ground circuits against battery ground for excessive resistance.
- Repair any short-to-voltage or open in the supply harness to the injector group.
- If wiring and grounds are good, replace the faulty injector control/driver module and re-test.
FAQ
Quick answers
Is it safe to drive with P2154?+
Not recommended — losing supply to an injector group can cause misfire, hard starting, or stalling, and prolonged misfire can damage the catalytic converter.
Can I just clear P2154?+
It clears, but returns quickly because the fault is an electrical circuit problem that has to be repaired, not reset.
Related codes
Read & clear P2154 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX