Question about 1991 GMC Sonoma

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Firewall knockouts where can i run the 3 cluster gauges to the engine from the cab through the firewall every other car i have had has had a few empty areas in the fire wall that you can pop the gromit out of any ideas

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There are many plug seals in the firewall where wires run through, use those access points

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On a 99 grand am the gas gauge allways reads empty what is the color is the ground wire for the gas gauge

It's not the ground wire , the gauge grounds inside the instrument cluster .Your sending unit or the gauge it's self is bad .
Body Control System Operation
The Body Control Module (BCM) performs the following functions:
Gauge control

Instrument cluster indicator control

Fuel gauge control

Temperature gauge control

Theft deterrent

A/C compressor request

A/C cooling fan

Exterior and interior lighting control for the following lamps:

Daytime Running Lights (DRL)

Automatic lighting control

Fog lamps

Interior lighting

Battery rundown


Gauge Control
The Body Control Module (BCM) receives Class 2 serial data messages from the Powertrain Control Module (PCM) to determine the following gauge information:
Engine coolant temperature

Fuel level sensing

Your best bet is to take your vehicle to a qualified repair shop !
Fuel Gage Inaccurate or Inoperative

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select the PCM display DTCs function on the scan tool.
Does the scan tool display any DTCs?
YES - Go to Diagnostic Trouble Code (DTC) List (2.4L) or Diagnostic Trouble Code (DTC) List (3.4L) in Engine Controls
NO - Go to Step 3


With the scan tool, select Instrument Panel Cluster, Special Functions and command the fuel gauge UP.
Does the fuel gauge complete a full sweep when commanded?
YES - Go to Step 4
NO - Go to Step 12
  1. Turn OFF the ignition.
  2. Disconnect the fuel level sender.
  3. Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit of the fuel level sender and the ground circuit of the fuel level sender.
  4. Turn ON the ignition, with the engine OFF.
  5. Important: Verify the J 33431-C resistance setting with a DMM.
  6. Set the resistance on the J 33431-C to 40 ohms.
Does the fuel gauge display at or below empty?
YES - Go to Step 5
NO - Go to Step 6

Jul 28, 2016 | Pontiac Grand Am Cars & Trucks

1 Answer

Where is the fuel gauge fuse on a 1998 Buick Century?

There is not a single fuse for the fuel gauge , there are a few that power up the whole instrument cluster ! If there were a fuse out more then just your fuel gauge wouldn't work .You probably have a bad sending unit in the fuel tank or the stepper motor for that gauge is bad ! The thing to do would be to take to the dealer or some other capable ASE certified repair shop that has a up scale scan tool that can check codes in the instrument cluster ! Or you can take a chance an replace the instrument cluster !
Fuel Gage Inaccurate or Inoperative
Inspect for any stored instrument cluster Diagnostic Trouble Codes (DTCs). Are any DTCs stored in memory?
Go to Diagnostic Trouble Code (DTC) List/Type
Go to Step 3


  1. Install a Scan Tool scan tool.
  2. Turn the ignition switch to the RUN position.
  3. Establish communication with the instrument cluster.
  4. Select special functions under the main menu.
  5. Select output control under special functions.
  6. Select fuel gauge sweep test under output control main menu.
Does the fuel gauge perform a full sweep when commanded?
Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 3.1L
Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 3.8L
Go to Step 4

May 23, 2015 | 1998 Buick Century

1 Answer

I just bought a 03 cavalier today. here's what happened, let the car run as I looked it over, I let the car run, no over heating. I bought it, put 10$ of gas it was 1/8 the ten brought it to 3/4, little...

Hi Vanessa; It appears that your problem is a very common complaint with MANY Cavalier and Sunfire models (2001-2005).

Many remedies or solutions include doing the following:
  • Check for a bad ground connection
    • check the existing ground strap for any oxidation (green stuff)
    • partially broken or fully broken ground strap
      • ground strap from the battery to engine block
      • ground strap from the engine block to the frame or firewall
    Replace the strap(s)

  • Check the cluster gauges for poor or missing solder connections; or some that may have loosened.
Re-solder the connections or replace the instrument cluster with either a new, rebuilt, or used instrument cluster from either the OEM, third party vendor, or junk yard.

  • Check the fuse panel for blown fuses; service manual notes (depending upon style model) that there are either 1 or 2 fuses that controls the instrument gauge cluster; (maybe marked CLUSTER or CLS/PCM; or BCMCL).
  • In the event the fuse(s) are not blown:
    • Disconnect the battery ground cable from the battery
    • Remove the fuse(s); turn ignition key cylinder to AUX position (not "start" or "run" positions), wait about 30 seconds, to fully discharge remaining capacitor voltage to any of the car's electronic control modules.
    • Reconnect the ground cable to the battery
    • and re-insert the fuses that were removed
Hopefully this will resolve the problem. Unfortunatley, I have read where some car owners have replaced their instrument gauge clusters 3 times; which leads me to believe one of two things; either there is a serious defect in the manufacture of these instruments (but I have not seen any mandatory or voluntary recall by NHTSA or GM) or because of some sort of owner related improper battery jumping procedures- causing a voltage spike, etc.

Hope this helps.

Mar 08, 2015 | Cars & Trucks

1 Answer

Manual says that if the airbag light is on, it can cause all of the gauges on the IP to quit working. It says to check Fuse #22.. Fuse is ok. Any suggestions?

cab fuse or engine bay fuse? JB or PDC box?
no not true.
so why not post what the car does good and bad.
car runs perfectly and shifts ? all that.
all other light in car work? radio, etc.
with parking lights on does cluster glow? (back ground illumination?)
the cluster warning lights are dead , all are dead?
are all gauges, dead too? if some are say what? are dead.?
fuel , and engine heat?

the fsm is free.with full docs and schematics, lets look together now.
WJ jeep 95
click wiring (at end)
chapter 8w-40-1
volt meter in hand.

see that page?
page 2 to 9 is cluster "instruments "
PDC fuse 17 (engine bay) is PDC
and cab JB fuse 10

so 22 is bogus. there is no fuse 22 (usa car)
there is fuse 22 terminal. on fuse 9 and fuse 21>?
forget terminals, we do fuses real names,

first off, the cluster is a computer, im not privy to its programming,
(is anyone?)
but it must communicate to the PCM or its will fail, on the canbus
so turn on ignition (car battery charged to 12.6vdc rested)
all warning lights come one.
if not the cluster is not happy, this is a selft tests. of lamps.
the fuse posted above are the only fuses for it. PDC 17 and JB10
we use a scan tool next to be sure the PDC is not barfing comm errors. first. (or DTCs stating power loss)

read the manual above
see the correct fuses for cluster
see that it is a computer with comm lines.
if those 2 pins on the cluster are12vdc key on then that is not the problem and the ground pin on cluster is at 0v, not 12v.

fuse 5 and 9 run (JB) run air bag computer box.

this is power to the cluster below, 8w-40--2
the whole cluster runs off those 4 power pins, if power is lost
the cluster brain goes dead. the left pin below is memory pin.
right top is main power. to cluster.

25449976-rfzsrgdtqaicmpcrwkc1npqq-2-0.jpg if this is good
a scan tool is necessary to move on.
just like all cars with CanBUS, ,
an innova 3140 works. good.

Feb 19, 2015 | 1995 Jeep Grand Cherokee

2 Answers

My cluster on my 05 Impala isn't working, the gas gauge and temp gauge is not where they are suppose to be the speedometer works. How can I reset it without buying another cluster?

You need to test your fuses. Go through with a tester and test each one. Verify you haven't lost your ground straps running from the back of your block to the firewall.

Sep 15, 2014 | 2005 Chevrolet Impala

1 Answer

Gauges going crazy

Euc? Do you mean ecu, the computer? Don't think so. Something in the cluster, maybe the little voltage regulator on the back of the cluster. But if the engine light is flashing, definitely have it scanned for trouble codes, first, to see why the light is on. The light may indicate a poor link or connection with the cluster.

Aug 13, 2013 | GMC Envoy Cars & Trucks

2 Answers

Temp gauge on dash panel goes from cold to hot without engine run

cluster or wiring problems find a good cluster and switch it out see if that works if it dosnt take to a mechanic and get your wiring checked it also might be a fuse with cross wiring

Jul 18, 2009 | 1997 Dodge Neon

1 Answer

Electrical problem with the dash.

This wiring problem can be much more costly, and time consuming, than you want to take on.
Professional mechanics cringe, when a wiring problem of this magnitude comes their way!

It's probably a bad ground for the instrument cluster.
The instrument cluster housing is plastic. There is a flat, thin, 2 to 3 inch wide, piece of plastic that is the wiring harness for this instrument cluster.
In this flat piece of plastic, are thin flat copper strips. These are like wires, to conduct the electricity to the gauges, lights, and the rest of the instrumentation.

Since the plastic instrument cluster is not metal, and therefore it can't be used as a Ground source, the flat piece of plastic I mentioned above, has a Ground wire to it. May be more than one.

This ground wire/s could have corrosion on the terminal end, where it attaches to the truck body.
Bad ground, everything goes haywire. The ground wires, might loose on the terminals used for the flat piece of plastic.

Another source of a bad ground problem overlooked, is that the cab of a truck receives it's,
Main ground from the engine.

There should be Two ground straps, coming from the firewall over to the engine. Sometimes, when the upper part of an engine, or the engine is replaced, the mechanic neglects to reinstall these ground straps.

Sometimes just one ground strap is reinstalled, and this is No good!
Also both terminal ends of these ground straps are a good source for corrosion to develop.
Corrosion makes a bad contact.

I myself would take the truck back.

Apr 19, 2009 | 1998 Chevrolet S-10 Pickup

2 Answers

Fuel gauge not working all the time.

This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The key must be in the OFF position throughout the entire refueling of the vehicle.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The transmission is in PARK (P).
The key is in the RUN position.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
The instrument cluster is in the anti-slosh (default) mode.
The actual fuel level in the tank is greater than what is being displayed by the fuel gauge

Feb 18, 2009 | 1983 Mercury Grand Marquis

1 Answer

2002 Liberty Fuel Gauge Not Working

It may be possible to get instrument cluster to do a self-test? If you want to try this to rule out instrument cluster.
Press and hold odometer reset button, turn key from off to run, run is where the dash lites come on. Any stored 3-digit codes will be displayed in the odometer vf display. The vf display will perform a sequential segment test. All indicators, data controlled, will illuminate. All gauges will cycle in 12.5% or 15% increments. The cluster will automatically exit self-test. The self test does not verify serial data stream. The cluster internally commands all non-hardwired gauges and indicators to operate. The fuel level sending unit sends info to pcm then pcm sends data to instrument cluster.
I don't know if that self-test will work on your vehicle? It won't hurt to try. If all the gages cycle except fuel gage, then I suspect the instrument cluster. You can call around different shops, get an estimate for the repair.

Jun 11, 2017 | 2002 Jeep Liberty

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