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 MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1824 (HYBRID CONTROLS - DTC P181C TO DTC P2792)DTC P2797CIRCUIT/SYSTEM TESTINGPWM INPUT FAULT
2006 Chevrolet Suburban C2500, 6.0 U
PWM Input Fault
2006 Chevrolet Suburban C2500, 6.0 USECTION PWM Input Fault
WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect PIM connector X1.
- Ignition ON, test for 11-13V on the Trans. Aux. Oil Pump Control circuit from PIM connector X1 terminal 3 and chassis ground.
- If less than the specified range, test the control circuit for an open or short to ground. If the circuit tests normal, replace the ATFP Control Module.
- Pre-Adjust the J 38522: variable signal generator to 50 percent duty cycle @ 250 Hz.
- Connect the J 38522:
variable signal generator to the Trans. Aux. Oil Pump Control circuit, from the PIM connector X1 terminal 3 and ground and listen for auxiliary transmission fluid pump motor operation.
- If pump operation is audible, replace the PIM.
- If pump operation is not audible, continue with Circuit/System Testing.
- Ignition OFF, disconnect the ATFP control module connector X1.
- Ignition ON, test for 0V on the Trans. Aux. Oil Pump control circuit from PIM connector X1 terminal 3 and chassis ground.
- If greater than the specified range, test the control circuit for a short to voltage.
- If equal to the specified range, replace the ATFP control module.
NOTE:
Only connect the J 38522:
variable signal generator to the auxiliary transmission fluid pump control circuit when adjusted to 50 percent duty cycle. Duty cycles of less than 50 percent may damage the auxiliary transmission fluid pump assembly.
RENDER: 1.0x
NO RELATED
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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.