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 239 (ENGINE CONTROLS SELF-DIAGNOSTICS - 3.1L ENGINE)DIAGNOSTIC TESTSDTC P0507: IDLE SPEED HIGHCONDITIONS FOR RUNNING TEST
1999 GMC Forward Control 5.7 R, Automatic
Conditions For Running Test
1999 GMC Forward Control 5.7 R, AutomaticSECTION Conditions For Running Test
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0401, P0403, P0404, P0405 or P0502 are not set.
- The Engine Run Time parameter is more than 2 minutes.
- The Engine Coolant Temperature (ECT) sensor parameter is more than 158°F (70°C).
- The Idle Air Temperature (IAT) sensor parameter is more than -0.4°F (-18°C).
- The Barometric Pressure (BARO) sensor parameter sensor parameter is more than 70 kPa.
- The Ignition 1 Signal parameter is 9-18 volts.
- The Throttle Position (TP) sensor parameter is less than 1.5 percent.
- The Vehicle Speed Sensor (VSS) parameter is less than 3 MPH.
- The above conditions are met for more than 8 seconds.
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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.