P2904 Code:

OBD-II Diagnostic Powertrain (P) Trouble Code

Possible Cause

By far the most common cause of thisP2904code is from worn or defective transmission shifter components. Other causes may include a defective range sensor, open, shorted, corroded, or otherwise damaged wiring and/or electrical connectors.

Common Symptoms

  1. This will help to determine whether or not the malfunction is intermittent
  2. This signal is systematically forwarded to affected control modules that utilize the data to accomplish various other tasks
  3. The exhaust gas temperature sensor is used in diesel engines, gasoline burning engines, and even turbocharged engines
  4. As exhaust temperature decreases (with the engine off), circuit resistance increases and the feedback voltage signal to the PCM decreases

Similar Problems

IC Module 4X Ref Circuit Intermittent, No Pulses
Control Module Throttle Actuator Position Performance
Transmission Control Module Reprogrammable Memory

P2904 Troubleshooting

When you put your foot down on the brakes you expect your car to quietly slow down and come to a stop. The power your foot applies on the brake pedal is assisted by hydraulic pressure. Your foot's force engages a piston and caliper with brake pads attached (bonded abrasive and heat resistance metal or ceramic) to put pressure on the rotor. P2904 OBD2 reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.

How to turn off P2904 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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