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 MANUALSBUICK1999REGAL LSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P0205-P0351DTC P0336DTC P0336: CRANKSHAFT POSITION (CKP) SENSOR CIRCUIT PERFORMANCE (5.7L "F" & "Y" BODIES)DIAGNOSTIC PROCEDURES
1999 Buick Regal LS
Diagnostic Procedures
1999 Buick Regal LSSECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
- Start and operate engine at idle for 2 minutes. Using scan tool, monitor FAILED THIS IGNITION display under DTC P0336. If scan tool indicates that this test failed this ignition, go to next step. If scan tool does not indicate that this test failed this ignition, see DIAGNOSTIC AIDS .
- Visually inspect CKP sensor circuits for routing too close to secondary ignition components, after-market components, solenoids, relays and motors. Repair as necessary. After repairs, go step 9. If routing is okay, go to next step.
- Check for poor connections/terminal tension at CKP sensor. Repair as necessary. After repairs, go to step 9. If connection or terminal tension is okay, go to next step.
- Check for poor CKP sensor circuit connections/terminal tension at PCM. Repair as necessary. After repairs, go to step 9. If connection or terminal tension is okay, go to next step.
- Remove and inspect CKP sensor. Replace CKP sensor if necessary. If CKP sensor is okay, go to next step.
- Visually inspect CKP sensor reluctor wheel for damage. Replace or repair reluctor wheel as necessary. If reluctor wheel is okay, go to next step.
- Replace CKP sensor. After replacing sensor, go to next step.
- Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0336. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2.
- Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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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.