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.
SYS.OK|MANUAL.DBβ LIVE
HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1699 (ENGINE CONTROLS AND FUEL - 6.6L - DTC P1448 TO DTC P2510)DTC P20E2CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect both harness connectors at EGT sensor 1 and sensor 2.
- Ignition OFF and scan tool disconnected for 90 seconds, Measure for a resistance of less than 5 Ξ© on each low reference circuit between terminals B and ground.
- If greater than the specified range, repair the open/high resistance on the affected circuit. If the circuit tests normal, replace the ECM.
- Ignition OFF, disconnect the X1 harness connector at the ECM.
- Test for less than 5 Ξ© between the signal circuit terminal A of the EGT sensor 1 and the corresponding terminal 69 X1 of the ECM.
- If greater than the specified range, repair the open/high resistance in the circuit.
- Test for less than 5 Ξ© between the signal circuit terminal A of the EGT sensor 2 and the corresponding terminal 93 X1 of the ECM.
- If greater than the specified range, repair the open/high resistance in the circuit.
- If all circuits test normal, test or replace the affected sensor.
NOTE:
Perform the Repair Verification after completing the Circuit/System Testing.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.