Symptoms
and severity of the code
Because the neutral safety switch is part of the transmission range sensor, the vehicle may start in any gear position and/or the PCM will force the transmission into “limp” mode. In this mode, there is a noticeable lack of power, especially from a complete stop.
There is a serious safety issue when this code is present due to the possibility of the vehicle starting in gear, causing it to move upon starting. This issue must be fixed immediately.
Causes
Potential causes
for setting this code are as follows:
- Faulty transmission range sensor “B”
- Misadjusted transmission range sensor “B”
- Open or shorted transmission range sensor wiring
- Faulty PCM
Diagnostic and repair procedures
There are two possible conditions that will cause this code to be set:
Condition #1- The PCM detects drive or reverse gear when starting the vehicle
Condition #2- The PCM detects park or neutral and the following conditions exist for 10 seconds or more:> Throttle position is 5% or more:> Engine torque is greater than 50 ft-lb. > Vehicle speed is greater than 20 mph
Based on my experience, this code is most common on four-wheel drive trucks that have been “four-wheeling” and have suffered damage to the range sensor and/or wiring harness. It would be very rare for a faulty PCM to cause this code. Diagnosing this code is quite simple. SET THE PARKING BRAKE.
Begin with a thorough visual inspection of the range sensor and cable harness. Repair any damage found. Does the vehicle start in reverse/drive? If it starts, unplug the range sensor and try to restart it in reverse/drive. If it still starts, suspect a short circuit in the harness. If it doesn’t start, suspect a faulty or misadjusted range sensor.
Related transmission range sensor codes: P2800, P2802, P2803 and P2804.