Question about 2002 Pontiac Grand Prix

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P0481 on grand prix 2002. cooling fans work with a/c on and relays seem ok. vehicle temp gauge opertaes ok and does not seem to get hot.

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Fans dont come on after I turn off ac

Posted on Apr 05, 2011

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Sounds normal, the fans were made to run continuous w/ ac running, but on sensor when ac is off. if car isn't overheating, the fans are probably running from time to time ,but your just not catching them running

Posted on Sep 11, 2009

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2005 montana sv6 sitting in traffic temp gauge goes up codes P0128 and P0481 present


DTC P0128 Engine Coolant Temperature (ECT) Below Thermostat Regulations Temperature
An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the powertrain control module (PCM) for engine control and as an enabling criteria for some diagnostics.
The air flow coming into the engine is accumulated and used to determine if the vehicle has been driven within the conditions that would allow the engine coolant to heat up normally to the thermostat regulating temperature. If the coolant temperature does not increase normally or does not reach the regulating temperature of the thermostat, the diagnostics that use ECT as enabling criteria may not run when expected.
If the PCM detects the calibrated amount of air flow and engine run time have been met, and the ECT has not met the minimum thermostat regulating temperature, DTC P0128 sets.

P0481
Cooling Fan Relay 2 Control Circuit
PCM
DTC P0480 or P0481

Have you changed the thermostat ?
Do you know how to test cooling fan relay (S)
Battery positive voltage is supplied to the cooling fan 1 relay from the COOL FAN #1 fuse. The powertrain control module (PCM) controls the cooling fan 1 relay by grounding the low speed cooling fan relay control circuit via an internal solid state device called a driver.
Battery positive voltage is supplied to the cooling fan 2 relay and the cooling fan 3 relay from the COOL FAN #2 fuse. The PCM controls the relays by grounding the high speed cooling fan relay control circuit.
When the PCM is commanding a relay on, the voltage potential of the control circuit should be low, near 0 volts. When the PCM is commanding the control circuit to a relay, the voltage potential of the circuit should be high, near battery voltage. If the fault detection circuit senses a voltage other than what is expected, the DTC will set.
The PCM will monitor the control circuit for the following conditions:
• A short to ground
• A short to voltage
• An open circuit
• An open relay coil
• An internally shorted or excessively low resistance relay coil
When the PCM detects any of the above conditions, the DTC will set and the affected driver will be disabled.

Jul 01, 2017 | Cars & Trucks

1 Answer

I have a 2002 Lincoln town car and I just put a brand new fan in and its not coming on my car runs hot when I have it in park with the ac on


Did you check the fan relays ? There are two, cooling low relay an cooling fan high relay . The relays are turned on by the vehicles PCM - engine computer , when an input from the coolant temp. sensor indicates a certain temperature ! When you turn on your A/C the cooling fan should turn on an stay on .
Relay Box
Left center of engine compartment
Cooling Fan High Relay
In relay box
Cooling Fan Low Relay
In relay box
Do you know how to test a computer controlled relay ? Go to you tube an search relay testing . Does the temp. gauge work correctly ? I know you probably don't have a factory scan tool , but this is the where I would start , checking temp. sensor input to the PCM . An with a factory scan tool I can do bidirectional testing , see if I could turn the fans on will scan tool .

Mar 17, 2016 | Lincoln Cars & Trucks

1 Answer

Cooling fan relay location


What year is the vehicle ? The cooling fan relays have nothing to do with the temp. gauge . GM had problems with the stepper motors inside the instrument cluster . Hooking up a professional scan tool to check what the PCM - engine computer is seeing from the engine temp sensor . You have duel cooling fans controlled by three relays . Checking to see what the actual engine temp. would be the first step , checking to see if the scan tool can control the cooling fans .
Look on youtube at videos on gm instrument cluster stepper motor problems

May 04, 2017 | Chevrolet Venture Cars & Trucks

2 Answers

Engine Overheating and fluctuating temp gauge??!!!


Sounds like you have a leaking engine head gasket.

Mar 03, 2017 | 1999 Pontiac Grand Prix

4 Answers

The temperature gauge on my 2002 grand prix dose


the temperature sending unit on a 97 grand prix 3800 gt(which is also the coolant temperature sensor) is not accurate. the sending unit part of this sensor only sends info to the guage on the dash. the coolant sensor part sends info to the computer of the car. it is located under thermostat and somewhat difficult to get at. i had put a brand new one in and my temperature on my dash is all over the place---even with good thermostat and properly bled system. when i hook up a scanner to my computer, the coolant sensor is sending the computer(ecu??) what seems to be the right temp. anywhere from 194 degrees to 217 when hot. the guage however on dash go from 160 to 260 in less than 2 minutes.

Nov 16, 2009 | 2002 Pontiac Grand Prix

2 Answers

3.1 L Grand Prix-cooling fan won't kick on, new fan motor-all fuses OK-temp when driving cools OK with AC fan on. Where are the relays ?


probably not a relay,check the coolant temp sensor to make sue its reading ok,if its misreading it will not tell the computer to turn the fan on

Oct 14, 2009 | 1994 Pontiac Grand Am

1 Answer

Heat fluctuation on temp gauge


change the sending unit to the fan, if that doesnt work check for power too the fan or even a bad fan

Mar 22, 2009 | 1995 Pontiac Grand Prix

1 Answer

1995 Pontiac grand prix's temp gauge goes hot


check to see if the electric fan is coming on when it should. Also check coolant level. Also, you may have the beginning of a plugged radiator If all else is OK flush radiator out.

Mar 21, 2009 | 1995 Pontiac Grand Prix

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