Question about 1992 Buick Roadmaster

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1992 Roadmaster temperature gage doesn't work

I have replaced the sensor on the engine and the temperature gage in the cluster still won't work. All the fuses are fine, and all the connections seem to be in order. What could be causing this?

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The likely cause of this issue would lie in the gauge in the cluster itself. These gauges are all electronic so there wouldn't necessarily be any other electrical issues in the vehicle. I would recommend removing the dash and testing the circuit which connects to that particular gauge. If that circuit is faulty you have located your problem. You can purchase a used gauge cluster from an auto salvage yard or even have your cluster rebuilt.

Posted on May 21, 2009

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Posted on Jan 02, 2017

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Engine temp gauge not reading and ac will not turn on due to engine hot warning, diognostics say its a sensor, need to know which one and can i do it myself?2003 saturn vue


What diognostics say its a sensor ?????? No diagnostic's ever tell's you it's a sensor . You as a technician would need to prove that by testing electrical circuits , viewing coolant temp sensor . Hooking scan tool and trying to command the gauge with by directional control . The temp gauge not showing any temp. ? No movement ? Engine Coolant Temperature Gage Inaccurate or InoperativeStep Action
Yes
No
Schematic Reference: Instrument Cluster Schematics
1
Did you perform the Instrument Cluster Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Instrument Cluster
2
Install a scan tool.
Turn the ignition ON, with the engine OFF.
With the scan tool, perform the Lamp and Gauge Check in the IPC Special Functions list.
Does the engine coolant temperature gage move up and down when commanded?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
3
Replace the IPC. Refer to Instrument Cluster Replacement .
Did you complete the replacement?
Go to Step 4
--
4
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2
Would hate for you to replace the coolant temp sensor an find out that's not the problem ! Does the vehicle start an run good ,trans mission shift good ? If so it's not the coolant temp sensor .
Engine Coolant Temperature Gage
The ECM sends coolant temperature as determined by the coolant temperature sensor to the BCM via CAN serial data. The IPC displays the engine coolant temperature with the gage when the BCM sends a class 2 message to the IPC indicating coolant temperature percentage. The engine coolant temperature gage defaults to cold (0°) or below if:
• The ECM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of class 2 communications with the BCM.
• The BCM detects a loss of CAN communications with the ECM.

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1 Answer

I cannot seem to find the engine cooling temp sensor on a 2007 buick rendezvous


Hi Julia , why do you believe you need to find the temp sensor ? Temp gauge not working ? The cooling Temp sensor is a input to the PCM / ECM - engine computer .
Engine Coolant Temperature Gage
The instrument panel cluster (IPC) displays the engine coolant temperature (ECT) as determined by the powertrain control module (PCM) or the powertrain control module (PCM). The IPC receives a class 2 message from the PCM indicating the ECT. The range on the ECT gage is between 60-125°C (140-260°F). The ECT gage defaults to 60°C (140°F) or below if the PCM detects a malfunction in the ECT sensor circuit. Refer to Cooling System Description and Operation .
Would have DTC- diagnostic trouble code stored in Instrument cluster or the check engine light would be on . Before replacing a part you may not need take it to a qualified repair shop to have it diagnosed .

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My 2008 Pontiac torrent gage is stuck at the top where the over heating mark is but there is no other indicators that it is overheating what does this mean.


The engine control module (ECM) calculates the engine coolant temperature as determined by the coolant temperature sensor. The ECM sends the engine coolant temperature to the body control module (BCM) via the serial data circuit. The instrument panel cluster (IPC) displays the engine coolant temperature when the BCM sends a serial data message to the IPC indicating the engine coolant temperature. The engine coolant temperature gage defaults to 0° or below if:
• The ECM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of serial data communications with the BCM.
• The BCM detects a loss of serial data communications with the ECM

The place to start would be to hook up a factory or professional scan tool to see what the actual coolant temperature is ! At the PCM then at the BCM and finally at the instrument cluster . If normal the gauge is bad . The instrument cluster would need to be taken out of the vehicle an sent to be repaired . Or you could buy a used one out of a salvage yard or from on e-bay etc....

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Do you have a check engine light on? If not then you have a defective gage, the gage is a computer generated display and you will need to remove the instrument cluster and send it out to be rebuilt. Cost about $250

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My 97 Nissan Altimas temperature gage inside car dash is stuck on the highest setting, past Hot. I replaced thermostat and temperature sensor. It's still not working. What else could be the problem?


Are you saying the gauge is stuck on hot even when the engine is cold ?
There could be a short to ground in the wiring or in the instrument cluster.

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Location of efi coolant temperature sensor


The Roadmaster uses the same engine layout as the Caprice. According to autozone.com you should have two sensors near the upper radiator hose outlet on the intake. One is a single wire sensor for the temp gauge, the other should be a two wire sensor for the ECM.
You might want to get a new sensor and look for it around the thermostat housing.

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1 Answer

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You need to find out the fault code that is stored that is causing the check engine light, the whole thing may be related to one failed part like the temperature sensor or the wiring to it.

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As long as the engine is NOT overheating, you can still drive it.

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