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 MANUALSPONTIAC1983GRAND PRIX BASE, 5.0 HREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 11 (FEEDBACK CARBURETOR TESTS W/CODES)CODE 14: COOLANT TEMP SENSOR (CTS) SHORTED

1983 Pontiac Grand Prix Base, 5.0 H

Code 14: Coolant Temp Sensor (Cts) Shorted

1983 Pontiac Grand Prix Base, 5.0 HSECTION Code 14: Coolant Temp Sensor (Cts) Shorted

WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 1984 Pontiac Phoenix, 1984 Pontiac Parisienne, 1984 Pontiac Grand Prix, 1984 Pontiac Firebird, and 1984 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.

Code 14 means the ECM has seen low resistance of the coolant temperature sensor circuit as high engine temperature, or low voltage at ECM term. "3", for a time longer than specified.

NOTE: The following step numbers refer to the numbers in the accompanying flow chart(s).

This test determines whether fault is in sensor or circuit. Normal circuit voltage is about 5 volts.
NOTE: Coolant sensor IS NOT connected during this test.
Checks for ground between ECM and coolant sensor. Test light to battery positive will be "OFF" in an ungrounded circuit.

Fig 1: Code 14: Coolant Sensor Shorted Flow Chart

RENDER: 1.0x

NO RELATED

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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.