Monday, August 13, 2012

Honda Accord EX 2.4L The check engine light is on with a code P2138

VEHICLE:  2006 Honda Accord EX 2.4L, L4, MFI, DOHC, Eng Desg K24A8

MILEAGE:  78,000

Customer Concern:
The check engine light is on with a code P2138, and at times the vehicle will not accelerate correctly.


1. Locate the Accelerator Pedal Position (APP) sensor on the firewall on the right side of the engine compartment. There is an accelerator cable running to it and a 6 wire Black connector on the APP sensor. Verify pin #1, the Yellow/Blue wire, has 5 volts key on from the Engine Control Module (ECM) and there is ground on the Green/Yellow wire pin #2. Then check the APP #2 sensor sweep on the Red/Yellow wire pin #3. The voltage should sweep from 0.2-0.3 volts to around 2.2-2.3 volts and not drop out.

2. Next check the APP #1 sensor and verify the Green/White wire pin #6 has a good ground and Pin #5, a Yellow/Red wire, has 5 volts. Then check the sweep signal on the Red/Blue wire pin #4, it should start at 0.5 volts and sweep up to 4.5 volts and not glitch or drop out. If any of the sensors drop out, the APP sensor will need to be replaced.

3. If the signals are good, check the reading on a scan tool or verify the wire harness and connections are good to the Engine Control Module (ECM).

Potential Causes:
Accelerator Pedal Position (APP) Sensor

Confirmed Fix:
Replaced Accelerator Pedal Position (APP) Sensor

2006 Honda Accord EX 2.4L The check engine light is on with a code P2138

1 comment:

  1. For GM domestic vehicles made before 1995, the diagnostic connector is located under the dash panel by the driver side. To get the check engine codes to flash in your dash panel, use a jumper wire or a paper clip and connect terminals A and B of the diagnostic connector.