P1171moderate severityPowertrain
Long Term Fuel Trim Upper Limit Lean
on 2013 Volvo C30 2.4L I5 · FWD
What this code means
The ECM detected that the long-term fuel trim has reached its upper lean correction limit. The fuel system cannot add enough fuel to compensate for the persistent lean condition.
Symptoms
- Check Engine Light
- Rough idle
- Hesitation on acceleration
- Poor fuel economy
- Possible lean misfire
Common causes
- Vacuum leak in intake system
- Faulty MAF sensor
- Weak fuel pump
- Clogged fuel injectors
- PCV system fault
Diagnostic steps
- Perform smoke test for vacuum leaks
- Monitor fuel trim values
- Test fuel pressure and volume
- Clean or test MAF sensor
- Inspect PCV system
Repair notes
Repair vacuum leaks first; address fuel delivery if trims remain at the lean limit.
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