P0232
HighP0232 — Fuel Pump Secondary Circuit High Voltage
Description
What the Code Means
Code P0232 indicates high voltage in the fuel pump secondary circuit. The engine control unit (DME) detects voltage above the allowed threshold. This can be caused by a short to power in the wiring, a faulty fuel pump relay (stuck closed), or a problem inside the DME itself.
Symptoms
Symptoms
- Engine running rich
- Fuel smell
- Check Engine light on
Causes and fixes
Diagnosis and Repair
Step 1: Check the Fuel Pump Relay
Check the relay for sticking (stuck closed). Replace it if needed.
Step 2: Check the Wiring
Inspect the wire harness from the relay to the pump for a short to battery voltage (B+).
Step 3: Check Fuel Pump Resistance
Measure the pump winding resistance with a multimeter. Compare it to the reference values.
Step 4: Repair or Replace
- Replace the faulty relay or repair the wiring.
- If the problem is in the DME, the DME must be diagnosed and, if necessary, replaced.
Possible secondary damage
Related Issues
Ignoring the fault isn't free — it leads to:
- Higher fuel pressure, which damages the injectors.
- Constant rich running, which causes overheating and failure of the catalytic converter.