Fuel Pump Module Control Circuit Low
The P025C code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the fuel pump module control circuit. This circuit is responsible for controlling the fuel pump relay or the fuel pump itself. A low voltage reading suggests a short to ground, open circuit, or a failing component such as the fuel pump module, relay, or wiring. This can lead to insufficient fuel pressure, causing drivability issues.
1. Most Common Causes
- Fuel pump control circuit shorted to ground
- Fuel pump module power or ground circuit open or shorted
- Faulty fuel pump control module (FPCM/FPDM)
- Faulty PCM (rare)
- Corroded, loose, or damaged connectors in the fuel pump circuit
2. Symptoms You Will Notice
- Engine cranks but does not start
- Engine stalls or hesitates during acceleration
- Check Engine Light illuminated
- Reduced fuel economy
- Fuel pump does not prime when key is turned on
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes (e.g., P025A, P025B).
Step 2: Inspect the fuel pump module wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the fuel pump relay and control circuit voltage using a multimeter.
Step 4: Check fuel pump operation by listening for priming noise or measuring fuel pressure.
Step 5: If wiring and relay are good, replace the fuel pump module.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may stall or fail to start, leading to a potential accident or being stranded.
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 fuel pump module needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.