P0850 - Park/Neutral Position Switch Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?
Possible causes
- Faulty Park/Neutral Switch
- Park/Neutral Switch harness is open or shorted
- Park/Neutral Switch circuit poor electrical connection
  What does this mean?
When is the code detected?
The signal of the park/neutral position (PNP) switch is not changed in the process of engine starting and driving.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0850 Description

The transmission manual shift shaft switch assembly, also known as the Internal Mode Switch (IMS), is a sliding contact switch attached to the manual shift shaft inside the transmission case. The Park/Neutral Position (PNP) Switch is integrated into the IMS and connects to the Transmission Control Module (TCM) lead-frame through a short wire harness. The 5 inputs to the TCM from the transmission manual shift shaft switch assembly indicate the transmission gear selector lever position. This information is used for engine start enable, engine controls as well as determining the transmission shift patterns. The state of each input is available for display on the scan tool. The five input parameters represented are Signal A, Signal B, Signal C, Signal P (Parity), and Signal N (Park/Neutral Start Signal). Park/Neutral Signal is sent from the Park/Neutral switch directly to the Engine Control Module (ECM) and is used for engine start enable. The Park/Neutral Signal circuit is not connected to the TCM internally; the circuit uses the TCM as a pass-through connector only. The ECM Park/Neutral diagnostic monitors the Park/Neutral Signal circuit to detect Low voltage when the ECM expects to see High voltage and High voltage when the ECM expects to see Low voltage.

P0850 Information for specific makes
P0850 BUICK Park/Neutral Position Switch Circuit
P0850 CADILLAC Park/Neutral Position Switch Circuit
P0850 CHEVROLET Park/Neutral Position Switch Circuit
P0850 CHRYSLER Park/Neutral Switch Input Circuit
P0850 DODGE Park/Neutral Switch Input Circuit
P0850 GMC Park/Neutral Position Switch Circuit
P0850 INFINITI Park/Neutral Switch
P0850 JEEP Park/Neutral Switch Input Circuit
P0850 NISSAN Park/Neutral Switch
P0850 PONTIAC Park/Neutral Position Switch Circuit
P0850 SATURN Park/Neutral Position Switch Circuit
Related Information
Repair Importance Level: 3
 
1=Low 2=Medium 3=High  
Repair Difficulty Level: 2
 
1=Easy 2=Moderate 3=Hard  
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