What Does P2148 Mean?
The PCM has detected abnormally high voltage in the fuel injector group A supply circuit. This suggests an open ground circuit or excessive resistance preventing proper injector operation.
Safety Warning
Will cause severe misfires and loss of power on affected cylinders. May result in catalyst damage and unsafe driving conditions. Repair immediately.
Common Causes
40%
Open or high resistance in injector ground circuit
25%
Corroded or loose ground strap connection at engine block
20%
Failed injector driver module unable to pull circuit to ground
10%
Open circuit in return path from injectors to PCM or driver module
5%
PCM internal driver circuit failure
Diagnostic Steps
1
Step 1: Locate and inspect all ground connections for injector circuit; clean and tighten all connections
2
Step 2: Measure resistance from injector ground circuit to known good chassis ground; should be less than 1 ohm
3
Step 3: Check voltage at injector connector with engine running; should pulse between 0-12V
4
Step 4: Test injector driver module ground side switching with oscilloscope or test light
5
Step 5: Verify PCM connector pins for corrosion or pushed-out terminals affecting ground circuits
Estimated Repair Cost
$120 - $950
Parts + labor, varies by vehicle and location
The PCM has detected abnormally high voltage in the fuel injector group A supply circuit. This suggests an open ground circuit or excessive resistance preventing proper injector operation.
The most common cause of P2148 (Fuel Injector Group "A" Supply Voltage Circuit High) is: Open or high resistance in injector ground circuit
Typical repair costs for P2148 range from $120 to $950, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Will cause severe misfires and loss of power on affected cylinders. May result in catalyst damage and unsafe driving conditions. Repair immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2148 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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