Fuel Trim Cylinder Balance Bank 1
2002-2009 GMC Envoy 4.2L I6 🇨🇦
Description
The PCM detected a rich or lean cylinder-to-cylinder air/fuel ratio imbalance on Bank 1. The diagnostic monitors the pre-catalyst O2 sensor frequency and amplitude by calculating accumulated voltage over a sample period. An imbalance is flagged when multiple samples are consistently offset from the desired value. Very common on V8 engines with Active Fuel Management (AFM).
Symptoms
- Check Engine Light
- Rough idle
- Decreased fuel efficiency
- Engine hesitation
- Light or intermittent misfire
- Extended crank time
- Hard starting
Common Causes
- Clogged or restricted fuel injector(s)
- Faulty upstream O2 sensor Bank 1
- Vacuum leak on Bank 1
- Dirty MAF sensor
- Cylinder misfire on Bank 1
- AFM (Active Fuel Management) lifter failure on V8 engines
Diagnostic Steps
- Check fuel trim values with scan tool
- Perform injector balance test
- Inspect for vacuum leaks with smoke test
- Clean or replace MAF sensor
- Test upstream O2 sensor Bank 1
- Check for cylinder misfires
Repair Notes
Check O2 sensor first if no performance symptoms. If running rough, inspect injectors for restriction. GM TSB #03-06-04-030F covers fuel injector clogging on 2000-2008 vehicles. On AFM engines, monitor for related misfire codes on cylinders 1, 4, 6, 7.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
P1174 on Other Vehicles
Common Questions
What does code P1174 mean on a 2002-2009 GMC Envoy?
P1174 stands for "Fuel Trim Cylinder Balance Bank 1". The PCM detected a rich or lean cylinder-to-cylinder air/fuel ratio imbalance on Bank 1. The diagnostic monitors the pre-catalyst O2 sensor frequency and amplitude by calculating accumulated voltage over a sample period. An imbalance is flagged when multiple samples are consistently offset from the desired value. Very common on V8 engines with Active Fuel Management (AFM).
What are the symptoms of P1174 on a GMC Envoy?
Common symptoms of P1174 include: Check Engine Light, Rough idle, Decreased fuel efficiency, Engine hesitation, Light or intermittent misfire, Extended crank time, Hard starting.
What causes P1174 on a 2002-2009 GMC Envoy?
Common causes of P1174 include: Clogged or restricted fuel injector(s), Faulty upstream O2 sensor Bank 1, Vacuum leak on Bank 1, Dirty MAF sensor, Cylinder misfire on Bank 1, AFM (Active Fuel Management) lifter failure on V8 engines.