P1237 – Fuel Pump Relay Contact Circuit
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Symptoms
- No start
- Intermittent stall
- Loss of power
- Long crank time
- Check engine light
Causes
- Burned relay contacts
- High resistance
- Corroded terminals
- Loose connections
- Wiring damage
Diagnosis
- Voltage drop test across relay
- Inspect relay terminals
- Check connector tension
- Inspect wiring
- Scan live data
Repair
- Replace relay
- Clean or replace terminals
- Repair wiring
- Secure connectors
- Clear codes and road test