P1237
Fuel Pump Secondary Circuit Fault
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$33–167 (est.)
Symptoms
- The engine stalls or does not start
- Loss of power during acceleration
- Unstable engine idling
- Check Engine Light Is On
- Increased fuel consumption
Causes
- Fuel pump malfunction
- Problems with the fuel pump relay
- Open or short circuit in wiring
- Engine control unit malfunction
- Poor contact in the fuel pump connectors
How to Fix
- Check the voltage at the fuel pump
- Inspect wiring and connectors for damage
- Check the operation of the fuel pump relay
- Test the fuel pump itself
- If necessary, replace the fuel pump or relay