P1291moderate severityPowertrain
No Temp Rise Seen From Intake Heaters
on 2012 Jeep Wrangler 3.6L V6 · 4WD
What this code means
The PCM did not detect a temperature rise from the intake air heaters when commanded on. No direct generic OBD equivalent.
Symptoms
- Hard cold starting
- Check engine light on
- Rough cold running
Common causes
- Faulty intake heater element
- Blown heater relay or fuse
- Wiring fault
- Faulty PCM
Diagnostic steps
- Scan for stored codes
- Test intake heater operation
- Check heater relay and fuse
- Inspect heater wiring and connectors
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Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1