EGR System Failure
1990-2001 Jeep Cherokee 4.0L I6 🇨🇦
Description
The PCM has detected a failure in the Exhaust Gas Recirculation system. The EGR valve is not operating as commanded, resulting in incorrect exhaust gas recirculation which affects emissions and can cause driveability issues.
Symptoms
- Check Engine Light
- Rough idle when EGR opens
- Engine pinging or knocking at cruise
- Failed emissions test
- Poor fuel economy
Common Causes
- Stuck or clogged EGR valve
- EGR passages blocked with carbon
- Faulty EGR solenoid or transducer
- Vacuum supply issue to EGR valve
- Faulty EGR position sensor
Diagnostic Steps
- Command EGR valve open with scan tool and monitor engine response
- Inspect EGR valve for carbon buildup
- Check vacuum supply to EGR valve
- Test EGR solenoid operation
- Clean EGR passages and valve
Repair Notes
Clean or replace the EGR valve and clean all EGR passages of carbon deposits.
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
P1403 on Other Vehicles
Common Questions
What does code P1403 mean on a 1990-2001 Jeep Cherokee?
P1403 stands for "EGR System Failure". The PCM has detected a failure in the Exhaust Gas Recirculation system. The EGR valve is not operating as commanded, resulting in incorrect exhaust gas recirculation which affects emissions and can cause driveability issues.
What are the symptoms of P1403 on a Jeep Cherokee?
Common symptoms of P1403 include: Check Engine Light, Rough idle when EGR opens, Engine pinging or knocking at cruise, Failed emissions test, Poor fuel economy.
What causes P1403 on a 1990-2001 Jeep Cherokee?
Common causes of P1403 include: Stuck or clogged EGR valve, EGR passages blocked with carbon, Faulty EGR solenoid or transducer, Vacuum supply issue to EGR valve, Faulty EGR position sensor.