P1238 – Fuel Pump Secondary Circuit Intermittent
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Symptoms
- Intermittent stall
- No start at times
- Loss of power
- Surging
- Check engine light
Causes
- Loose connector
- Broken wire
- Heat‑related open
- Relay dropout
- Control module issue
Diagnosis
- Wiggle test harness
- Check for heat‑related faults
- Inspect connectors
- Monitor voltage while driving
- Scan freeze frame data
Repair
- Repair wiring
- Replace connectors
- Replace relay
- Secure harness
- Replace control module if needed