Fuel Injector Group Supply Voltage Circuit/Open
The P2149 code indicates a problem in the supply voltage circuit for a group of fuel injectors. This typically means the PCM has detected an open or short in the power supply to one or more injectors, often due to a faulty injector driver, damaged wiring, or a failed injector. This can cause misfires, poor fuel economy, and potential engine damage if not addressed.
1. Most Common Causes
- Open or short in the injector supply voltage circuit
- Faulty fuel injector driver in the PCM
- Damaged wiring or connector at the injector
- Failed fuel injector (internal short or open)
2. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Poor fuel economy
- Engine hesitation or lack of power
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the wiring and connectors for the injector group for damage or corrosion.
Step 3: Measure voltage at the injector connector with key on; should be battery voltage.
Step 4: Test injector resistance with a multimeter; compare to specs (typically 12-16 ohms).
Step 5: If wiring and injectors are good, suspect a faulty PCM injector driver.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause misfires, reduced fuel economy, and potential catalytic converter damage. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but can be higher if the PCM needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.