Early Fuel Evaporation Heater Circuit
2002-2007 Buick Rendezvous 3.4L V6 🇨🇦
Description
The PCM detected a malfunction in the Early Fuel Evaporation (EFE) heater circuit. The EFE system heats the intake to aid fuel vaporization during cold starts. The PCM checks EFE heater resistance with the heater off (should be above 2.5V) and on (should be below 0.3V).
Symptoms
- Check Engine Light
- Rough idle when cold
- Poor cold-start performance
- Increased cold-start emissions
- Poor fuel economy in cold weather
Common Causes
- Failed EFE heater element
- EFE heater control circuit open
- EFE heater ignition power circuit open
- Corroded EFE heater connections
- PCM failure (rare)
Diagnostic Steps
- Test EFE heater element for continuity
- Check control circuit voltage
- Test ignition power supply to heater
- Inspect wiring and connectors for corrosion
- Monitor EFE circuit with scan tool
Repair Notes
Test EFE heater element resistance. Replace heater if open. Check power supply and control circuit wiring.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1250 on Other Vehicles
Common Questions
What does code P1250 mean on a 2002-2007 Buick Rendezvous?
P1250 stands for "Early Fuel Evaporation Heater Circuit". The PCM detected a malfunction in the Early Fuel Evaporation (EFE) heater circuit. The EFE system heats the intake to aid fuel vaporization during cold starts. The PCM checks EFE heater resistance with the heater off (should be above 2.5V) and on (should be below 0.3V).
What are the symptoms of P1250 on a Buick Rendezvous?
Common symptoms of P1250 include: Check Engine Light, Rough idle when cold, Poor cold-start performance, Increased cold-start emissions, Poor fuel economy in cold weather.
What causes P1250 on a 2002-2007 Buick Rendezvous?
Common causes of P1250 include: Failed EFE heater element, EFE heater control circuit open, EFE heater ignition power circuit open, Corroded EFE heater connections, PCM failure (rare).