C0029 Diagnostic Trouble Code

C0029 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C0029 diagnostic trouble code may include:

Diminished fuel efficiency
Fuel pressure too high
Malfunction Indicator Lamp (MIL) illuminated
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Faulty IMRC actuator/sensor

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.

Process Tips

Diagnostic trouble code C0029 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before C0029.

Fortunately, C0029 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0029 Trouble Code For Specific Cars

C0029 Dort Roadster Ignition Tamper Circuit Short To Battery
C0029 Glas 1300 Over Temperature Fault
C0029 Bertone Blitz Brake Motor Warning lamp Circuit Short to Vbatt
C0029 Cadillac Brougham Data Mismatch (receive data does not match what was expected)
C0029 Mercedes-benz Ml Class Air Suspension Front Compressor Relay Circuit Short To Ground
C0029 Healey Westland Passengers Seat Belt Buckle Switch Circuit Short to Ground
C0029 Morgan 4 Booster Pedal Force switch circuit Failure