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Pinpoint Test Ab: P1636

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Normal Operation and Fault Conditions 

    The TCM contains Phoenix drivers, which are chips that control the low sides of the solenoid circuits to provide the commanded current. The main processor in the TCM communicates with the Phoenix drivers over a serial interface. The main processor sends the desired solenoid state, and the Phoenix drivers return circuit fault status information.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    TCM P1636:00 Inductive Signature Chip Communication Error: No Sub Type Information This DTC indicates an internal TCM loss of communication with the low side solenoid drivers. When communication is lost, the solenoid states become unknown, so the TCM opens the high side of the circuit, releasing all clutches. Only neutral is available with the TCC released and maximum line pressure.

    Possible Sources 

    • TCM fault

  2. AB1 RECHECK THE TCM (TRANSMISSION CONTROL MODULE) FOR DTC (DIAGNOSTIC TROUBLE CODE) P1636

    • Ignition ON.

    • Using a diagnostic scan tool, clear the DTC from the TCM.

    • Repeat the following steps 2 times.

      • Start the engine.

      • Select Drive.

      • Wait 5 seconds.

      • Select Reverse.

      • Wait 5 seconds.

      • Select Park.

      • Ignition OFF.

    • Using a diagnostic scan tool, carry out the TCM self-test.

    Is DTC P1636 present in the TCM? 

    Yes  INSTALL a new TCM. REFER to: Transmission Control Module (TCM) . CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download .
    No  GO to  AB2

  3. AB2 ROAD TEST THE VEHICLE AND RECHECK THE TCM (TRANSMISSION CONTROL MODULE) FOR DTC (DIAGNOSTIC TROUBLE CODE) P1636

    • Road test the vehicle.

    • Ignition OFF.

    • Road test the vehicle a second time.

    • Using a diagnostic scan tool, carry out the TCM self-test.

    Is DTC P1636 present in the TCM? 

    Yes  INSTALL a new TCM. REFER to: Transmission Control Module (TCM) . CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download .
    No  The fault is not present at this time.
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