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 C1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1160 (POWER TAKE-OFF SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P159C (PTO)CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban C1500, 5.3 Z
Circuit/System Testing
2006 Chevrolet Suburban C1500, 5.3 ZSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the PTO module.
- Connect a test lamp between the signal circuit terminal 31 and ground.
- Ignition ON, command the PTO remote engine shutdown using the upfitted remote engine shutdown switch. The test lamp should turn ON as the switch is depressed and OFF as the switch is released.
- If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the upfitted remote engine shutdown switch.
- If the test lamp is always OFF, test the remote engine shutdown switch supply voltage circuit and the signal circuit for a short to ground or an open/high resistance. If both circuits test normal, test or replace the upfitted remote engine shutdown switch.
- If all circuits test normal, replace the PTO 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.