Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 286 (HYBRID ENGINE CONTROLS - DTC P181C TO DTC P2792)DTC P2797CIRCUIT/SYSTEM TESTINGTEMP SEN FAULT
2009 Chevrolet Tahoe Base, 4.8 C
Temp Sen Fault
2009 Chevrolet Tahoe Base, 4.8 CSECTION Temp Sen Fault
WARNING: This page is about a different car, the 2010 GMC Yukon, 2010 Chevrolet Tahoe, and 2010 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
This display indicates an internal ATFP control module fault exists, no external circuits are involved. Replace the ATFP control module.
Low Voltage
- This display indicates the ATFP control module has monitored battery voltage of less than 12.6V.
- Measure actual battery voltage with a DMM.
- If actual battery voltage measures less than the value range, increase actual battery voltage and repeat Circuit/System Testing.
- If actual battery voltage measures more than the value range, test the ATFP control module power and ground circuits for a high resistance condition. If the circuits test normal, replace the ATFP control module.
ATFPCM Over temp
- This display indicates the ATFP control module circuit board has reached a temperature of 115-125°C (239-257°F).
- Measure the actual temperature of the ATFP control module case.
- If actual temperature is the same or more than the value range, no action is necessary.
- If actual temperature is less than the value range, replace the ATFP control module.
ATFPCM Hot
- This display indicates the ATFP control module circuit board has reached a temperature of more than 125°C (257°F).
- Measure the actual temperature of the ATFP control module case.
- If actual temperature is the same or more than the value range, no action is necessary.
- If actual temperature is less than the value range, replace the ATFP control module.
Current High/Lo
- This display indicates the ATFP control module has monitored motor current that is outside the normal range for a given motor speed.
- Inspect for the following conditions:
- Low or cavitating automatic transmission fluid
- Poor terminal connection or wiring degradation
- External indication of ATFP pump motor damage
- If none of the conditions are observed, replace the ATFP motor/pump assembly and the ATFP control module.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.