What Does P2157 Mean?
The PCM has detected that the voltage supply to fuel injector group D is higher than expected. This indicates an issue with excessive voltage in the power supply circuit or a driver circuit fault.
Common Causes
30%
Short to voltage in injector group D wiring harness
25%
Faulty PCM injector driver circuit stuck high
20%
Failed injector power relay stuck closed or stuck contacts
15%
Damaged wiring causing cross-circuit voltage feed
10%
PCM ground circuit fault causing voltage reference issue
Diagnostic Steps
1
Step 1: Disconnect injector group D connector and measure voltage at harness side (should be 0V with key off)
2
Step 2: Check for voltage bleeding from adjacent circuits or pinched wires
3
Step 3: Test injector relay operation and check for stuck contacts causing continuous power
4
Step 4: Verify all PCM grounds are clean, tight, and have less than 0.1 ohm resistance to battery negative
5
Step 5: Monitor injector driver signal with oscilloscope to verify PCM output is correct
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The PCM has detected that the voltage supply to fuel injector group D is higher than expected. This indicates an issue with excessive voltage in the power supply circuit or a driver circuit fault.
The most common cause of P2157 (Fuel Injector Group "D" Supply Voltage Circuit High) is: Short to voltage in injector group D wiring harness
Typical repair costs for P2157 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause engine flooding, hard starting, or rough running. Safe to drive cautiously but increased risk of catalytic converter damage from excess fuel.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2157 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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