Fuel Injector Group Supply Voltage Circuit Low
P2147 indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the supply circuit for a group of fuel injectors. This circuit provides the necessary voltage for injector operation. A low voltage can cause injectors to malfunction, leading to poor engine performance, misfires, and potential damage to the catalytic converter.
01. Most Common Causes
- Faulty fuel injector driver module
- Open or shorted wiring in injector supply circuit
- Corroded or loose connector at injector or PCM
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced engine power and poor acceleration
- Increased fuel consumption
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect injector wiring and connectors for damage or corrosion.
Step 3: Use a multimeter to check voltage at injector supply circuit (should be battery voltage with key on).
Step 4: Test injector driver module output if equipped.
Step 5: Check PCM for proper operation if all else is normal.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with low voltage to injectors can cause misfires, poor fuel economy, and potential catalytic converter damage.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, but costs can vary if the PCM or injector driver module needs replacement.