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 83 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0172: FUEL TRIM SYSTEM RICHDTC PARAMETERS
1999 GMC Forward Control 5.7 R, Automatic
DTC Parameters
1999 GMC Forward Control 5.7 R, AutomaticSECTION DTC Parameters
WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.
- ECT 140-239°F (60-115°C).
- IAT -13-239°F (-25-115°C).
- MAP pressure is more than 26 kPa on M/T or 28 kPa on A/T.
- Engine speed at 850-3410 on M/T or 750-3600 on A/T.
- Vehicle speed less than 82 MPH.
- Fuel level more than 9.8 percent.
- BARO more than 72 kPa.
- No CMP, CKP, ECT, fuel injector, IAT, knock, MAP, misfire, TP, HO2S1, VSS, P0446, P0601, P0602 or P1441 DTCs are set.
DTC sets when LTFT value is less than 70 (-46 percent) for more than 16 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.