What does P029C Cylinder 1 Injector Restricted mean?
The P029C trouble code refers to a possible restriction in the fuel injector for cylinder #1 of the engine.
Fuel injectors are responsible for delivering the correct amount of fuel to each cylinder in a precise pattern.
When there is a restriction in the fuel injector, it can cause a lean condition in the exhaust and lead to diminished engine performance, reduced fuel efficiency, and the possibility of cylinder head or engine damage.
Some possible causes for this code include a defective or clogged fuel injector, open or shorted fuel injector circuit, faulty oxygen sensor, or a PCM or programming error.
To diagnose this code, it is important to inspect the fuel injection rail area and use tools such as a diagnostic scanner and a digital volt/ohmmeter for testing.
P029C Symptoms
- Diminished engine performance
- Reduced fuel efficiency
- Lean exhaust codes
- Misfire codes
Possible P029C Causes
- Defective and/or clogged fuel injector
- Open or shorted fuel injector circuit(s)
- Faulty oxygen sensor(s)
- PCM or programming error
- Mass air flow (MAF) or Manifold Air Pressure (MAP) sensor failure
Troubleshooting P029C error code
- Inspect the fuel injector in question for corrosion or leakage
- Connect a diagnostic scanner and retrieve stored codes and freeze frame data
- Clear the codes and test-drive the vehicle to see if the code is reset
- Perform an injector balance test using the scanner
- Use an automotive stethoscope to audibly monitor the fuel injector for the presence of clicking sound
- Test for voltage and ground pulse using a digital volt/ohmmeter (DVOM)
- Check system fuses and relays
- Trace the circuit back to the ignition switch or fuel injection module if no voltage is present
