P1243
Second Fuel Pump Faulty Or Ground Fault
Severity
🔴 HighCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)
Symptoms
- Unstable engine operation under load
- Loss of power during acceleration
- Difficulty starting the engine
- Floating idle speed
- Check Engine Light Illuminates
Causes
- Malfunction of the second fuel pump
- Damage to the pump ground circuit
- Oxidation of contacts in the fuel pump connectors
- Problems with the fuel pump relay
- Open or short circuit in wiring harness
How to Fix
- Check the operation of the second fuel pump
- Inspect the pump ground circuit for damage.
- Check the contacts in the fuel system connectors
- Test fuel pump relays and fuses
- Diagnose the fuel pump wiring harness