P1291 Code CHRYSLER Possible Causes
- Air heater relay fault
- Battery cable condition
- Electrical circuit fault
How is the P1291 CHRYSLER Code Repaired?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
When is the P1291 CHRYSLER Code Detected?
The engine is running and the Engine Control Module (ECM) has not detected a temperature increase in the intake heater circuit
What are the Possible Symptoms of the P1291 CHRYSLER Code?
- Engine light on (or Service Engine Soon warning light)
What Does the P1291 CHRYSLER Code Mean?
The intake air heater temperature rise is monitored during the first 15 seconds of engine operation. The P1291 code may be stored if the initial reading of the Intake Air Temperature (IAT) sensor is 0 to 66°F (-17.8 to 18.8°C), the Battery Temperature Sensor (BTS) and the Intake Air Temperature (IAT) sensor are within 10°F of each other, the time between the end of preheating and the engine running state is less than 30 seconds, the engine is cranked for less than 5 seconds before engine start, preheating is completed before engine start, post-heating is active, and no IAT sensor or intake air heater relay DTCs exist.