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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 342 (STARTING SYSTEM)DIAGNOSTIC INFORMATIONDTC P0562TESTING
1999 GMC Forward Control 5.7 R, Automatic
DTC P0562: Testing
1999 GMC Forward Control 5.7 R, AutomaticSECTION Testing
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
- Did you perform the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL? If so, go to next step. If not, go to DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL .
- With the scan tool monitor the IGNITION 1 SIGNAL voltage in the PCM data list. Does the scan tool display Ignition 1 voltage greater than the specified value of 10.5V? If so, go to step 4. If not, go to next step.
- Test the ignition feed circuit to the PCM for high resistance or open. Did you find and correct the condition? If so, go to step 7. If not, go to step 5.
- Inspect for poor connections at the PCM. If you find a poor connection, repair the condition as necessary. Did you find and correct the condition? If so, go to step 7. If not, go to step 6.
- Repair the ignition feed circuit to the PCM for an open or a short to ground. After repair is complete, go to step 7.
- Replace the PCM. See POWERTRAIN CONTROL MODULE . After replacement is complete, go to next step.
- Select the DIAGNOSTIC TROUBLE CODE (DTC) option and the Clear DTC Information option using the scan tool. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text, if applicable. See CONDITIONS FOR RUNNING THE DTC . Does the DTC reset? If so, go to step 2. If not, then system is okay.
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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.