DTC Troubleshooting: P2138
DTC P2138: APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2138 APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation
      

1.
Problem verification:

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

?2.
Clear the DTC with the HDS.


?3.
Press the accelerator pedal to the floor.

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2138 APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation
     

Is DTC P2138 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 APP sensor and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
2.
Determine possible failure area (short in APS lines, others):

Determine possible failure area (short in APS lines, others)
?1.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
APP SENSOR A
    
APP SENSOR B
    

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.


?3.
Disconnect the following connector.
PCM connector A (51P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector A (51P): disconnected
Test point 1
PCM connector A (51P) No. 45
Test point 2
PCM connector A (51P) No. 38

Is there continuity?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P2138 goes away and the PCM was updated, troubleshooting is complete. If DTC P2138 goes away and the PCM was substituted, replace the original PCM.?
4.
Shorted wire check (APS1 line to APS2 line):

Shorted wire check (APS1 line to APS2 line)
?1.
Disconnect the following connector.
APP sensor 6P connector

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector A (51P): disconnected
 
APP sensor 6P connector: disconnected
Test point 1
PCM connector A (51P) No. 45
Test point 2
PCM connector A (51P) No. 38

Is there continuity?

     
YES
     
     
     
Repair a short in the APS1 wire to the APS2 wire between PCM connector terminals A45 (APS1 line) and A38 (APS2 line).?
     
NO
     
     
     
The APS1 and APS2 wires are OK. Replace the APP sensor.?