Skip to content
GTECH Calibration
Portal

P1899

Park Neutral Position Switch Stuck In Park or In Gear.

  • Plymouth
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
8
AreaTransmission
99
FaultThe specific fault in that area

What it means

On the Plymouth, P1899 means the engine or transmission control unit has seen a Park/Neutral position switch signal that does not match how the vehicle is behaving. The switch appears to be stuck reporting Park/Neutral while the car is moving in gear, or stuck reporting in gear when the car is at rest in Park or Neutral. The exact logic and switch location depend on the model, engine and transmission fitted.

Symptoms

  • Engine will not crank, or cranks in some selector positions but not others
  • Engine starts in gear, or fails to start in Park or Neutral
  • Reverse lights not working or staying on
  • Rough or unstable idle when selecting Drive or Reverse
  • Harsh, delayed or incorrect gear engagement
  • Malfunction indicator lamp on, possibly with a transmission warning

Possible causes

  • Park/Neutral position switch (transmission range sensor) out of adjustment or worn internallylikely
  • Selector cable or linkage out of adjustment so the lever position does not match the transmissionlikely
  • Damaged, corroded or loose wiring or connector at the switchlikely
  • Open or short circuit in the switch signal wire to the control unitpossible
  • Contaminated or water-damaged switch from fluid leaks or ingresspossible
  • Faulty engine or transmission control unit input circuitrare

How to diagnose

  1. Read stored and pending codes and freeze frame data, noting speed, gear selected and engine state when the code set
  2. Check for other related codes such as speed sensor or starter circuit faults and deal with those first
  3. Inspect the switch connector and wiring for damage, corrosion, chafing, fluid contamination and loose pins
  4. Check the selector lever and cable for wear and correct alignment with the transmission range detent in each position
  5. With a scan tool, watch the live Park/Neutral switch status while moving the selector through every position and compare it with the lever position
  6. Test the switch with a multimeter for continuity and correct signal changes in each range, using the manufacturer's data for your model
  7. Check the supply, earth and signal circuit for resistance, open circuits and shorts to voltage or earth
  8. Check the transmission fluid level and condition and look for leaks onto the switch

How to fix

  • Adjust the Park/Neutral switch to the manufacturer's procedure for your model
  • Adjust or replace the selector cable or linkage so lever and transmission positions agree
  • Repair or replace damaged wiring and clean or replace faulty connectors
  • Replace the Park/Neutral position switch if it fails electrical tests or shows internal wear
  • Fix any fluid leak that is contaminating the switch, then clear the code and road test to confirm it stays off

Can I keep driving?

Medium severity

The car may be driveable, but it could fail to start or start in gear, which is a safety risk. Get it checked soon and avoid relying on it until it is fixed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

Nearby codes