Fuel Injector Group Supply Voltage Circuit High
P2148 indicates that the powertrain control module (PCM) has detected a voltage level in the fuel injector group supply circuit that is higher than the specified range. This circuit provides power to a group of injectors, and an overvoltage condition can be caused by a faulty injector driver, a short to voltage in the wiring, or a malfunctioning PCM. High voltage can damage injectors and other components, leading to poor engine performance or no-start conditions.
01. Most Common Causes
- Short to voltage in the injector group wiring harness
- Faulty injector driver circuit in the PCM
- Corroded or damaged connector at the PCM or injectors
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced engine power or hesitation
- Possible no-start condition
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the injector group wiring harness for shorts, chafing, or damage.
Step 3: Measure voltage at the injector group supply circuit with a multimeter; compare to manufacturer specs.
Step 4: Check for continuity and resistance in the circuit; repair or replace any faulty wiring or connectors.
Step 5: If wiring is okay, test the injector driver circuit; if faulty, replace the PCM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as high voltage can damage injectors and the PCM, leading to costly repairs. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $100 to $300, depending on the cause. Wiring repairs are cheaper, while PCM replacement can be more expensive.