What Does P2154 Mean?
The PCM has detected excessive voltage in the fuel injector group C power supply circuit. This overvoltage condition can damage injectors and affect fuel delivery accuracy.
Safety Warning
Overvoltage can permanently damage fuel injectors and may cause erratic fuel delivery. Potential fire hazard exists if wiring has been compromised.
Common Causes
35%
Faulty PCM voltage regulator or injector driver malfunction
30%
Shorted wiring creating voltage spike from adjacent high-voltage circuit
20%
Defective fuel injector relay providing excessive voltage output
15%
Charging system overvoltage condition affecting entire electrical system
Diagnostic Steps
1
Step 1: Test charging system voltage with engine running (normal range 13.5-14.5V)
2
Step 2: Measure voltage at injector group C connector during key on and engine running conditions
3
Step 3: Inspect injector harness for chafed insulation or shorts to power circuits
4
Step 4: Test injector relay for proper voltage regulation and switching function
5
Step 5: Use scan tool to monitor PCM injector driver voltage if parameter is available
Estimated Repair Cost
$100 - $1,200
Parts + labor, varies by vehicle and location
The PCM has detected excessive voltage in the fuel injector group C power supply circuit. This overvoltage condition can damage injectors and affect fuel delivery accuracy.
The most common cause of P2154 (Fuel Injector Group "C" Supply Voltage Circuit High) is: Faulty PCM voltage regulator or injector driver malfunction
Typical repair costs for P2154 range from $100 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Overvoltage can permanently damage fuel injectors and may cause erratic fuel delivery. Potential fire hazard exists if wiring has been compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2154 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
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