C1342 Diagnostic Trouble Code

C1342 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 C1342 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.

Process Tips

Diagnostic trouble code C1342 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 C1342.

Fortunately, C1342 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1342 Trouble Code For Specific Cars

C1342 Mercedes-benz W123 Air Suspension LF Air Spring Solenoid Output Circuit Short To Battery
C1342 Chery A1 Door Unlock Disarm Switch Circuit Short To Battery
C1342 Steyr Haflinger Lamp Tail Output Circuit Short To Ground
C1342 Holden Hb Power Door Memory Lock Relay Circuit Failure
C1342 Honda Passport Rear Cargo Door Set Switch Stuck (Short to Ground)
C1342 Maserati Shamal Transmission Indeterminate Failure (Failed to Neutral)
C1342 Jaguar Xj-7 Seat Driver Front Up/Down Motor Stalled