What Does P2147 Mean?
The PCM has detected abnormally low voltage in the fuel injector group A supply circuit. This indicates a short to ground or excessive current draw affecting multiple injectors.
Safety Warning
May cause severe misfires, loss of power, and potential engine damage. Short circuit could drain battery or cause electrical fire. Do not drive.
Common Causes
40%
Short to ground in injector power supply wiring harness
25%
Failed fuel injector with internal short causing excessive current draw
20%
Chafed or damaged wiring rubbing against engine or chassis ground
10%
Failed injector driver module with internal short
5%
Water intrusion in injector connector causing short circuit
Diagnostic Steps
1
Step 1: Disconnect all injectors in group A and measure resistance from power supply to ground; should be infinite
2
Step 2: Reconnect injectors one at a time while monitoring circuit resistance to isolate shorted injector
3
Step 3: Inspect injector harness for damage, particularly near heat sources or moving components
4
Step 4: Check injector driver module for signs of overheating or component failure
5
Step 5: Measure individual injector resistance and compare to specifications (typically 12-16 ohms)
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage in the fuel injector group A supply circuit. This indicates a short to ground or excessive current draw affecting multiple injectors.
The most common cause of P2147 (Fuel Injector Group "A" Supply Voltage Circuit Low) is: Short to ground in injector power supply wiring harness
Typical repair costs for P2147 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause severe misfires, loss of power, and potential engine damage. Short circuit could drain battery or cause electrical fire. Do not drive.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2147 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
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