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 MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 203 (CRUISE CONTROL SYSTEM)DIAGNOSTIC TESTSDTC P1574: BRAKELIGHT SWITCH CIRCUITTESTING
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
DTC P1574: BRAKELIGHT Switch Circuit: Testing
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Testing
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- Perform the CRUISE CONTROL DIAGNOSTIC SYSTEM CHECK . Once test has been performed, go to next step.
- Connect the scan tool to the Data Link Connector (DLC). Turn on the ignition, with the engine off. Retrieve the DTCs from the EBCM. If there are any DTCs that begin with a "C" also set, see ANTI-LOCK/TCS - BOSCH 5.3 - C, G, H & K BODIES article in BRAKES. If not, go to next step.
- Repair the short to voltage on the brakelight switch signal circuit. If this corrects the condition, go to next step.
- Use the scan tool to clear the DTCs. Operate the vehicle within the conditions for running the DTC as specified in the supporting text. If the DTC resets, go to step 2.
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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.