DTC Troubleshooting: P0850
DTC P0850: Neutral Position Sensor A/B Incorrect Voltage Correlation
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0850 Neutral Position Sensor A/B Incorrect Voltage Correlation
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Move the shift lever to all driving position, then move it to the neutral position.

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0850 Neutral Position Sensor A/B Incorrect Voltage Correlation
    

Is DTC P0850 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the neutral position sensor and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
2.
Determine possible failure area (neutral position sensor, others):

Determine possible failure area (neutral position sensor, others)
?1.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
NEUTRAL POSITION SENSOR 1
    
NEUTRAL POSITION SENSOR 2
    

Are they the same voltage?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Determine possible failure area (PCM, others):

Determine possible failure area (PCM, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


?3.
Disconnect the following connector.
PCM connector No. 1 (96P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector No. 1 (96P): disconnected
Test point 1
PCM connector No. 1 (96P) No. 28
Test point 2
PCM connector No. 1 (96P) No. 30

Is there continuity?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
The NSS1 wire and the NSS2 wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0850 goes away and the PCM was substituted, replace the original PCM.?
4.
Shorted wire check (NSS1 line to NSS2 line):

Shorted wire check (NSS1 line to NSS2 line)
?1.
Disconnect the following connector.
Neutral position sensor 4P connector

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector No. 1 (96P): disconnected
 
Neutral position sensor 4P connector: disconnected
Test point 1
PCM connector No. 1 (96P) No. 28
Test point 2
PCM connector No. 1 (96P) No. 30

Is there continuity?

     
YES
     
     
     
Repair a short in the NSS1 wire to the NSS2 wire between PCM and the neutral position sensor.?
     
NO
     
     
     
The NSS1 wire and the NSS2 wire are OK. Replace the neutral position sensor.?