P2792 – High Circuit Direction Selection Circuit

P2792 Possible Causes

  • Faulty range sensor
  • Faulty transmission shift lever
  • Shift lever harness is open or shorted
  • Poor electrical connection in shift lever circuit

How to Fix Code P2792

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Engine light on (or service engine soon warning light)

P2792 Meaning

The Transmission Control Module (TCM) monitors the gate select direction circuit signal. The TCM sets the OBDII code when the gate select circuit signal is outside factory specifications.

P2796 – Electronic Transmission Fluid Auxiliary Pump Control Circuit

P2796 Possible Causes

  • Faulty Electronic Transmission Fluid Auxiliary Pump
  • Electronic Transmission Fluid Auxiliary Pump Harness is Open or Shorted
  • Poor Electrical Connection in Electronic Transmission Fluid Auxiliary Pump Circuit

How to Fix Code P2796

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check Engine Light On (or Service Engine Soon Warning Light)

P2796 Meaning

The Electronic Transmission Fluid Auxiliary Pump is used to maintain transmission engagement when the engine is stopped and the transmission is running. The Transmission Control Module (TCM) monitors the Electronic Transmission Fluid Auxiliary Pump control circuit. The TCM sets the OBDII code when the signal from the Electronic Transmission Fluid Auxiliary Pump control circuit falls outside factory specifications.

P2797 – Auxiliary Transmission Fluid Pump Performance

P2797 Possible Causes

  • Faulty auxiliary transmission fluid pump
  • Auxiliary transmission fluid pump harness is open or shorted
  • Poor electrical connection in auxiliary transmission fluid pump circuit

How to Fix Code P2797

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P2797 Meaning

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Two of the motor control modules operate their respective drive motor generator based on commands from the inverter module. The third motor control module controls the auxiliary transmission fluid pump motor. The hybrid powertrain control module and motor control modules share the power inverter module’s ignition voltage circuit, battery voltage circuits, and chassis ground.

P2798 – Low auxiliary transmission fluid pump control circuit

P2798 Possible Causes

  • Defective auxiliary transmission fluid pump
  • Auxiliary transmission fluid pump wiring harness is open or short-circuited
  • Poor electrical connection in the auxiliary transmission fluid pump circuit

How to Fix Code P2798

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check engine light on (or service engine soon warning light)

P2798 Meaning

The Transmission Control Module (TCM) monitors the auxiliary transmission fluid pump control circuit. The TCM sets the OBDII code when the signal from the auxiliary transmission fluid pump control circuit falls outside factory specifications.

P2799 – High Auxiliary Transmission Fluid Pump Control Circuit

Code P2799: Transmission Auxiliary Pump Circuit Malfunction

Code Meaning

The Transmission Control Module (TCM) has detected an anomaly in the transmission auxiliary pump control circuit. The electrical signal is outside the parameters specified by the manufacturer, indicating a problem in the transmission fluid management system.

Probable Causes

  1. Auxiliary Pump Failure: Mechanical or electrical failure of the pump.

  2. Wiring Issues:

    • Open circuit or short circuit in the wiring harness

    • Wire damage (chafing, corrosion, breakage)

  3. Connector Faults:

    • Broken, bent, dislodged, or oxidized pins

    • Poorly engaged or contaminated connectors

  4. TCM Malfunction (less frequent): Internal problem with the control module.

Common Symptoms

  • 🔶 Check Engine Light illuminated (or “Service Engine Soon”)

  • Sluggish gear changes

  • Transmission overheating

  • Entry into limp mode

  • Abnormal noises from the pump

Diagnostic Procedure

Preliminary Steps

  1. Advanced diagnostic scan:

    • Read associated fault codes

    • Check TCM real-time data

Visual Inspection (Priority)

Area to Inspect Check Points
Wiring Harness Damaged, pinched, or melted wires
Connectors

  • At the auxiliary pump

  • At the TCM

  • Intermediate anchor points | Oxidation, mechanical play, sealing |
    | Pins | Deformation, corrosion, partial insertion |

Electrical Checks

  1. Continuity test:

    • Between TCM connector terminals and the pump

  2. Resistance test:

    • Compare with manufacturer values (typically 5-25 Ω)

  3. Short circuit check:

    • To ground

    • Between phases

  4. Voltage measurement:

    • When activating the pump via diagnostic tool

Pump Validation

  • Direct power supply (12V) to test mechanical operation

  • Flow measurement if possible (depending on accessibility)

Repair Protocol

Identified Cause Solution
Faulty Wiring Repair or replace the harness
Damaged Connectors Clean contacts or replace the connector
Failed Pump Replace the auxiliary pump
TCM Software Issue Update the module firmware
TCM Failure Reprogram or replace the module

Important: After repair, clear the fault codes and perform a validation drive cycle. Verify that code P2799 does not reappear.

Additional Explanations:
The auxiliary pump ensures hydraulic pressure at idle or low speeds in modern transmissions (notably dual-clutch gearboxes). Its malfunction can cause jerking, loss of oil pressure, and damage to clutches or actuators. Prompt intervention is recommended to avoid costly collateral damage.

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P279A – High-End Four-Wheel Drive Performance

P279A Possible Causes

  • Faulty Engine Control Module (ECM)
  • Engine Control Module (ECM) harness is open or shorted
  • Poor electrical connection in Engine Control Module (ECM) circuit

How to Fix Code P279A

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P279A Meaning

The Engine Control Module (ECM) uses the following two methods to determine whether the transfer case is in 4WD Low, 4WD High, or Neutral.
1. The first method is to compare the transmission output speed sensor with the transfer case output speed sensor to calculate the transfer case range.
2. The second method is to use a LAN message sent from the transfer case shift control module to the ECM.
The ECM uses this message to determine required engine torque and transmission shifting.
Internal fault detection is handled within the control module. No external circuit diagnosis is involved.

P279B – All-Wheel Drive Low Range Performance

P279B Possible Causes

  • Faulty Engine Control Module (ECM)
  • Engine Control Module (ECM) harness is open or shorted
  • Poor electrical connection in Engine Control Module (ECM) circuit

How to Fix Code P279B

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P279B Meaning

The Engine Control Module (ECM) uses the following two methods to determine whether the transfer case is in 4WD Low, 4WD High, or Neutral.
1. The first method is to compare the transmission output speed sensor with the transfer case output speed sensor to calculate the transfer case range.

2. The second method is to use a LAN message sent from the transfer case shift control module to the ECM.

The ECM uses this message to determine required engine torque and transmission shifting.
Internal fault detection is handled within the control module. No external circuit diagnosis is involved.

P279C – Four-Wheel Drive Neutral Range Performance

P279C Possible Causes

  • Faulty Engine Control Module (ECM)
  • Engine Control Module (ECM) harness is open or shorted
  • Poor electrical connection in the Engine Control Module (ECM) circuit

How to Fix Code P279C

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P279C Meaning

The Engine Control Module (ECM) uses the following two methods to determine whether the transfer case is in 4WD Low, 4WD High, or Neutral.
1. The first method involves comparing the transmission output speed sensor to the transfer case output speed sensor to calculate the transfer case range.

2. The second method uses a LAN message sent from the transfer case shift control module to the ECM.

The ECM uses this message to determine required engine torque and transmission shifting.

Internal fault detection is handled within the control module. No external circuit diagnostics are involved.

P279D – Four-Wheel Drive Range Signal Circuit

P279D Possible Causes

  • Faulty all-wheel drive range chain
  • Four-wheel drive range harness is open or shorted
  • Poor electrical connection in the four-wheel drive range circuit

How to Fix Code P279D

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check Engine Light illuminated (or Service Engine Soon warning light)

P279D Meaning

The Transmission Control Module (TCM) monitors the signal from the four-wheel drive range signal circuit. The TCM sets the OBDII code when the four-wheel drive transmission range signal circuit signal is outside factory specifications.