Question about 2003 Chevrolet Silverado 2500HD

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Where is the lighting control module part number LM455 located on a 2003 chevy 2500HD?

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Flasher relay????? back side of the fuse box under the dash. turn the hazard lights on and listen for the clicking.

Posted on Sep 23, 2009

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Locate vacuum modulator chevy trailblazor 2003


Please verify the year of your truck. A 2003 Chevy Trailblazer has a 4L60E transmission. This transmission does not have a vacuum modulator valve. The 4L60 uses a vacuum modulator valve but the last year for that transmission was 1992. The perpose of the modulating valve is to control/regulate line pressure. The line pressure in a 4L60E is computer controlled or controlled electrically.

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Trailer light issues


Hi Donald,
It sounds like a wiring issue. Double the wiring to your connector on the vehicle. Also check the wiring on the trailer connector. I have seen many trailer that are wired to ground through the ******, this of course will cause an intermittent ground and flickering lights. you only need four (4) wires... One for a ground, One for running lights, and Two wires for brake and turn - one wire for the left and one wire for the right. You can also find the proper pin wiring for vehicle and trailer on the internet. Cheers. I hope this helps. John

Jul 05, 2012 | 2003 Chevrolet Silverado 2500HD

1 Answer

How do i install a transfer control module on a 2001 chevy silverado 2500hd


the transfer case control module is located behind the left side of dash behind the headlight switch, you will need to remove the speedo trim around speedometer, then pull put the headlight switch. the module is just snaped into place. also keep in mind, the module has to programmed with software for it to work correclty. in other words, the replacement module will have to be programmed after installing

Jan 08, 2012 | 2001 Chevrolet Silverado 2500HD

1 Answer

Location of ECM


Hi James:
The PCM (Powertrain Control Module) also called ECM (Engine Control Module) is located on a bracket on the side of the engine compartment...


12_21_2011_6_08_07_pm.jpg

Fig. Powertrain control module (1), radiator support (2), left frame rail (3), wiring harness connectors (4) (zooming link)

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Dec 21, 2011 | 2003 Chevrolet Silverado 2500HD

1 Answer

I have a 2003 chevy 2500hd with the airbag light on and a message on the dash that says service air bag any ideas what could be wrong?


You need to get the codes from the Supplemental Inflatable Restraint module S.I.R.This is the only way to tell what is causing the light to come on.Let me know what codes you get and I`ll be glad to help you out.Hope this helps.Good luck.

Feb 03, 2011 | 2002 Chevrolet Silverado 2500HD

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Apr 01, 2010 | 2005 Chevrolet Silverado

1 Answer

Brake lights on a 2003 chevy silverado 2500HD wont work.


same bulb but 2 seperate elements. wiring diagram u should be able to obtain from your local auto parts store like autozone(preferred)

Sep 23, 2009 | 2003 Chevrolet Silverado 2500HD

1 Answer

2003 chevy 2500hd no brake lights


your truck has fuses for the rear and high mount brake light in the fuse box in the side of the dash when you open the drivers door

Dec 23, 2008 | 2003 Chevrolet Silverado 2500HD

5 Answers

CHEVY SILVERADO 2500HD DURAMAX DIESEL


DTC P1093
Fuel Rail Pressure Low During Power Enrichment



The engine control module (ECM) uses the fuel rail pressure (FRP) sensor to determine fuel pressure to the fuel injectors. This is then compared to the calculated target fuel pressure as determined by the ECM. The ECM adjusts the FRP by modulating the duty cycle of the control driver of the fuel pressure regulator. Injector pulse duration is determined by the measured rail pressure and the target injection fuel into each cylinder. If a sensor circuit malfunction is detected, or the commanded fuel injection pump flow is not within the proper range for a given engine load and speed, DTCs will be set.

DTC U1000 and U1255 Circuit Description Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for State of Health monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within about five seconds of beginning serial data communication, DTC U1000 or U1255 is set. When more than one critical parameter does not have an identification number associated with it, the DTC will only be reported once. The class 2 serial data line on this vehicle is a ring/star configuration. The following modules communicate on the class 2 serial data line:
• The body control module (BCM) • The digital radio reciever • The driver door module (DDM) • The electronic brake control module (EBCM) • The front passenger door module (FPDM) • The HVAC control module • The inflatable restraint sensing and diagnostic module (SDM) • The instrument panel cluster (IPC) • The memory seat module (MSM) • The powertrain control module (PCM) • The radio • The radio amplifier • The rear seat audio (RSA) controller • The rear seat entertainment (RSE) assembly w/U42 • The rear wheel steering control module • The remote playback device-CD player w/U1S • The transfer case shift control module • The transmission control module (TCM) w/Allison transmission • The theft deterrent control module • The vehicle communication interface module (VCIM) w/UE1

Jul 12, 2008 | 2003 Chevrolet Silverado 2500HD

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