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 MANUALSCHEVROLET2023CAMARO SS, 2D COUPE, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEBODY, CAB CONTROL SYSTEMSPOWER DOOR LOCKS AND VEHICLE ACCESS SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESDTC P257D-P257FCIRCUIT/SYSTEM TESTING
2023 Chevrolet Camaro SS, 2D Coupe, Standard Trans
Circuit/System Testing
2023 Chevrolet Camaro SS, 2D Coupe, Standard TransSECTION Circuit/System Testing
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the electrical connector: B55 Hood Ajar Switch
- Test for less than 10 ohms between the test points: Ground circuit terminal 3 & Ground
- If 10 ohms or greater
- Ground Connection - Disconnect
- Test for less than 2 ohms between the test points: Ground circuit terminal 3@Component harness & Ground Connection
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- If less than 2 ohms - Repair the open/high resistance in the ground connection.
- Go to next step: If less than 10 ohms
- Ignition - On/Vehicle - In Service Mode
- Verify DTC P257E is not set.
- If the DTC is set
- Test for infinite resistance between the test points: Signal circuit terminal 1@Component harness & The other end of the circuit
- If less than infinite resistance - Repair the short to ground on the circuit.
- If infinite resistance - Replace the component: K20 Engine Control Module
- Go to next step: If the DTC is not set
- Connect a 5 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground
- Verify DTC P257F is not set.
- If the DTC is set
- Ignition/Vehicle - Off
- Disconnect the electrical connector: K20 Engine Control Module
- Test for less than 1 V between the test points: Signal circuit terminal 1@Component harness & Ground
- If 1 V or greater - Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Test for less than 2 ohms between the test points: Signal circuit terminal 1 & The other end of the circuit
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- If less than 2 ohms - Replace the component: K20 Engine Control Module
- Go to next step: If the DTC is not set
- Test or replace the component: B55 Engine Hood Switch
NOTE:
It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
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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.