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 MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 703 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0571-P0573CIRCUIT/SYSTEM TESTING
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
Circuit/System Testing
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the CHMSL relay.
- Ignition OFF, exterior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal 86 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
- If the test lamp illuminates, test the control circuit for a short to voltage.
- Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the CHMSL relay.
- Ignition OFF, connect the CHMSL relay.
- Ignition OFF, disconnect the harness connectors at the appropriate control modules listed below.
- ECM X2 and TCM module (LNF)
- ECM X1 and TCM module (L61 or LE5)
- Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
- ECM harness connector X2 terminal 52 (LNF)
- ECM harness connector X1 terminal 55 (L61 or LE5)
- Ignition ON, press and release the brake pedal. Verify the test lamp turns ON and OFF when pressing and releasing the brake pedal.
- If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- Ignition OFF, connect the harness connector at the ECM module.
- Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
- TCM terminal 42 (LNF)
- TCM terminal 42 (L61 or LE5)
- Ignition ON, press and release the brake pedal. Verify the test lamp turns ON and OFF when pressing and releasing the brake pedal.
- If the test lamp is always OFF, test the signal circuit for an open/high resistance. If the circuit test normal, replace the ECM module.
- If all circuits test normal, replace the TCM.
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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.