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 MANUALSPONTIAC1997GRAND PRIX GTP, 4D SEDANREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSAXLE DIAGNOSIS - 4T65-EDIAGNOSTIC TESTSDTC P1860: TCC PULSE WIDTH MODULATED (PWM) SOLENOID ELECTRICAL PROBLEMCONDITIONS FOR SETTING DTC P1860
1997 Pontiac Grand Prix GTP, 4D Sedan
Conditions For Setting DTC P1860
1997 Pontiac Grand Prix GTP, 4D SedanSECTION Conditions For Setting DTC P1860
DTC will set under the following conditions:
- System voltage is 9-16 volts.
- Engine speed is more than 500 RPM for 5 seconds.
- PCM detects a low circuit voltage when PWM duty cycle is more than 90 percent.
- PCM detects a high circuit voltage when PWM duty cycle is less than 10 percent.
- Engine is not in fuel shut off mode.
- All conditions are met for 5 seconds.
DTC P1860 will be stored in PCM history. MIL will light at first failure signal. PCM will inhibit TCC and 4th gear if transaxle is in hot mode. PCM disables shift adapts.
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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.