P1629 Diagnostic Trouble Code

P1629 is a kind of OBD-II Diagnostic P-Powertrain 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 P1629 diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code P1629 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 P1629.

Fortunately, P1629 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1629 Trouble Code For Specific Cars

P1629 Chevrolet Cavalier Driver Power Window One Touch Window Relay Circuit Short To Battery
P1629 Fiat Armadillo Lamp Headlamp High-Beam Circuit Open
P1629 Toyota Venza Passenger Rear Seat Down Switch Circuit Short to Battery
P1629 Peugeot 3008 EGI Glow Plug Secondary Failure
P1629 Dodge Coronet Ignition Coil G Primary/Secondary Circuit Malfunction
P1629 Steyr G-series Lamp Tail Output Circuit Short To Battery
P1629 Buick Centieme Cylinder 6 Contribution/Balance Fault