P2138 Chevrolet Silverado 1500

The voltage difference between APP sensor 1 and APP sensor 2 exceeds a value of 2 percent for more than 0.3 seconds.

Action Taken When the DTC Sets

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

Conditions for Clearing the DTC

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

1. «Engine Controls Connector End Views»(ref-238192-S16921739062006072400000)
2. «Engine Control Module (ECM) Connector End Views»(ref-238192-S02812492482006072400000)

Electrical Information Reference

1. «Circuit Testing»(ref-238178-S39570233092006072400000)
2. «Connector Repairs»(ref-238178-S40461273312006072400000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-238178-S33329058682006072400000)
4. «Wiring Repairs»(ref-238178-S26381606952006072400000)

Scan Tool Reference

1. «Scan Tool Data List (Engine Control Module)»(ref-238297-S10359974192006072400000) or «Scan Tool Data List (Glow Plug Control Module)»(ref-238297-S11797710032006072400000)
2. «Scan Tool Data Definitions»(ref-238297-S01843878982006072400000)
3. «Scan Tool Output Controls»(ref-238297-S23484851252006072400000)