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Engine fault code C086B for 2003 Chevy 2500HD

Engine fault code C086B for 2003 Chevy 2500H, what is it?

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: 2003 Chevy 2500HD Dash Gauges not working

There are known issues with the gauges on the 03 silverado. Even though the cages appear analog, they are stepper motor controlled by the computer. This is a fancy way of saying digital. Check with the dealer about a recall! Since all gauges appear to have quit at one time I would agree with a previous post that the computer program is flawed. It may need to be reset - again check with the dealer.

Posted on Nov 10, 2008

  • 37 Answers

SOURCE: 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

Posted on Dec 09, 2008

  • 508 Answers

SOURCE: locate the oil sending unit on a 2003 6.0 2500HD silverado

You will find it down by the oil filter.

Posted on Feb 07, 2009

  • 718 Answers

SOURCE: location of engine thermostats on 2003 ch2500hd turbo diesel

Check this location.
Between the alternator and A/C compressor, on the top. The other thermostat with vent holes goes toward the rear of the engine.
I believe the temp ratings are different for each.
Let engine cool before working on it.
Clean up an spilled radiator fluid. It will destroy pets liver in 24 hours if they drink it.

Posted on May 31, 2009

BLAZZ81
  • 281 Answers

SOURCE: i have a Chevy cavalier 2003 the check engine

This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Posted on Mar 14, 2010

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