Question about 2004 Chevrolet Silverado 2500HD

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What controls the tachometer? - 2004 Chevrolet Silverado 2500HD

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There is a sensor on the engine that measure engine revolutions, that sends a signal to the PCM (power train control module) which then sends a signal to the instrument cluster causing the gauge to move accordingly. For more information on common silverado tachometer problems and how to get them fixed check out this page - silverado instrument cluster repair

Posted on Sep 30, 2010

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Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair
Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair

Posted on Oct 07, 2010

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Tachometer
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Tachometer Inoperative (Gas)
Step
Action
Value(s)
Yes
No
1
Did you perform the OBD II System Check been performed?
--
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check (5.0L/5.7L); Powertrain On Board Diagnostic (OBD) System Check (7.4L)
2
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--
Go to Step 3
Go to Step 4
3
Locate and repair the short to ground in CKT 121 (WHT) between the Ignition Coil and the I/P cluster. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
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--
4
Connect a J 39200 DMM (continuity) from I/P Cluster cavity 6 to ignition coil connector cavity B.
Is continuity present?
--
Go to Step 5
Go to Step 6
5
Replace the I/P Cluster. Refer to Instrument Cluster Replacement .
Is the repair complete?
--
Refer to Instrument Cluster System Check
--
6
Locate and repair the open in CKT 121 (WHT) between the Ignition Coil and the I/P Cluster. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Refer to Instrument Cluster System Check

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What you need to do is to scan your onboard computer network, incluuding the PCM, BCM, IPC and the ABS modules to see where the problem is located. It may even be a communications network error. There is no way of knowing for sure without establishing communications with the network and interfacing with all of the control modules that use the tachometer signal to perform certain functions.

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