2008 Chevrolet Silverado 2500HD - Page 4 - Answered Questions & Fixed issues


Yes, that is literally the sole purpose for the neutral safety switch. To prevent the vehicle from starting in gear. If the neutral safety switch is malfunctioning, there is a very good change that the vehicle will not crank.

Chevrolet... | Answered on Nov 01, 2018 | 63 views


1149 ?? P1149 What engine ? 4.3 , 4.8 , 5.3 , 6.0 etc....
What or how did you come up with this code ? This code has nothing to do with your vehicle . Your best bet , take it to a qualified repair shop .

Chevrolet... | Answered on Nov 01, 2018 | 45 views


Get a voltage tester. Set it on DC volts. Disconnect the electrical connector at the horn. Have someone operate the horn switch and see if you're getting 12-volts in the connector. If so, replace the horn. If not, check the horn relay

Chevrolet... | Answered on Nov 01, 2018 | 77 views


It may do just fine. If it does not, the computer may throw up a code and you may have to make the computer relearn the CPS.

Chevrolet... | Answered on Oct 30, 2018 | 45 views


sensor that was replaced per the code scanner , That's where you made your mistake . No code tell's you to replace a part without testing . Did you do factory trouble shooting per code diagnostic testing procedures ?
The inflatable restraint front end sensor utilizes a unidirectional 2-wire circuit. The front end sensor modulates current on the interface to send ID, state of health, and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and a ground for the front end sensor. When the ignition is turned ON and input power from the SDM is first detected, the front end sensor responds by performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds. The front end sensor continually communicates status messages to the SDM, which determines if a fault is present in the front end sensor circuit. When a fault is detected, the SDM may reset the front end sensor up to 2 times by removing and reapplying power to it. If the fault is still present, the SDM will set a DTC.

B0091 00
• The front end sensor has been shorted to voltage, open, or shorted to ground.
• The front end sensor current has been above 23 mA for longer than 5 milliseconds.
• The SDM has not received a message from the front end sensor for more than 375 milliseconds.

Circuit/System Testing
Important: When removing the connectors, inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
• Front end sensor
• SDM module
• Front end sensor wiring harness connector
• SDM wiring harness connector
Ignition OFF, disconnect the harness connector at the front end sensor and the SDM.
Ignition ON, test for less than 1 volt between the front end sensor signal circuit terminal 2 and ground.
? If greater than the specified range, test the signal circuit for a short to voltage.
Ignition ON, test for less than 1 volt between the front end sensor low reference circuit terminal 1 and ground.
? If greater than the specified range, test the low reference circuit for a short to voltage.
Test for infinite resistance between the front end sensor signal circuit terminal 2 and ground.
? If less than the specified value, test the signal circuit for a short to ground.
Test for infinite resistance between the front end sensor low reference circuit terminal 1 and ground.
? If less than the specified value, test the low reference circuit for a short to ground.
Test for less than 1 ohm between the SDM signal circuit terminal 38 and the front end sensor circuit terminal 2 harness connector.
? If greater than the specified range, test the signal circuit for an open/high resistance.
Test for less than 1 ohm between the SDM low reference circuit terminal 36 and the front end sensor circuit terminal 1 harness connector.
? If greater than the specified range, test the low reference circuit for an open/high resistance.
If all circuits test normal, test or replace the front end sensor.
Reconnect all SIR components. Ignition ON, verify the DTC is not set as current.
? If the DTC resets as current, replace the SDM.

Chevrolet... | Answered on Oct 28, 2018 | 297 views


If you have your owner's manual, look for APO fuse (auxiliary power outlet). If no manual look at the underwood fuse box cover, it lists all fuses, and the left side dash panel fuse cover. Chevy calls them APO now.

Chevrolet... | Answered on Oct 27, 2018 | 48 views


achetez Pi?ces Fifa 19 Switch ? l'adresse https://fr.fifacoin.com. profitez de jusqu'? 10% de r?duction

Chevrolet... | Answered on Oct 24, 2018 | 25 views


Which engine and transmission .

Chevrolet... | Answered on Oct 22, 2018 | 37 views


sounds like a bad coolant sensor is tripping the fan relay ON as soon as ignition power get to it, gauge gets reading from bad sensor. Good luck

Chevrolet... | Answered on Oct 15, 2018 | 31 views


it is the fuel pressure regulator that is responsible for running the fuel pump
as the pressure varies the regulator tells the ECM to turn on/off the relay to the pump

Chevrolet... | Answered on Sep 07, 2018 | 34 views


no
the oil travels with the gas and collects in the compressor and the receiver / drier

Chevrolet... | Answered on Aug 26, 2018 | 30 views


Remove the breather box, this will give you access to the bulb. Turning counter clockwise and remove.

Chevrolet... | Answered on Aug 16, 2018 | 29 views


What code's ? # code's P0 what ? Any BCM - body control module code's ? Did you do diagnostic test's for said code's ? Do you know what a factroy diagnostic flow chart is ? Is the vehicle a 4X4 or 2X4 ? What engine ? Do you know what class 2 serial data bus is ? Do you have wiring diagrams ?
Headlamp ON/OFF control is determined by the body control module (BCM) by a signal on the headlamp switch headlamp on signal circuit when the headlamp switch is in the HEAD position. When the headlamp switch is in the AUTO position, the BCM determines headlamps ON/OFF by the voltage from the ambient light sensor.

High Beams
The high beam headlamps receive voltage from the headlamp HI relay located in the underhood fuse block. The body control module (BCM) controls the relay on the headlamp high beam relay control circuit. High beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is grounded, the BCM grounds the headlamp high beam relay control circuit, illuminating the high beam headlamps. The right and left high beam circuits are independent and are fused independently in the underhood fuse block. The right and left headlamps are grounded at G100 and G104.
The high beam indicator is illuminated when the instrument cluster receives a class 2 serial data message from the BCM that the high beams are illuminated.
Low Beams
The low beam headlamps receive voltage from the headlamp LOW relay located in the underhood fuse block. The body control module (BCM) controls the relay on the headlamp low beam relay control circuit. Low beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is open, the BCM grounds the headlamp low beam relay control circuit, illuminating the low beam headlamps. The right and left low beam circuits are independent and are fused independently in the underhood fuse block. The right and left headlamps are grounded at G100 and G104.

DTC B2645
The body control module (BCM) monitors the ambient light sensor signal circuit in order to determine if the daytime running lights (DRL) or the auto headlights (ALC) should be turned ON in the AUTO mode. When the BCM senses the ambient light sensor signal voltage is between 1.75-4.9 volts, either the DRL will be commanded ON or the ALC will be commanded ON depending upon the amount of light received by the sensor.

DTC B2645 Ambient Light Sensor Circuit

Chevrolet... | Answered on Aug 09, 2018 | 90 views


Disconnect the cables again and touch both together for about 1-min to reset computer and body control module. Connect the pos cable first, negative cable last

Chevrolet... | Answered on Jun 11, 2018 | 53 views


Check the sending unit?

Chevrolet... | Answered on Jun 02, 2018 | 39 views


try reformatting. Windows has it built in. File explorer selct device right click and select format

Chevrolet... | Answered on May 30, 2018 | 71 views


Your best bet is to call a local parts store and ask this question because some are some are not they can look it up for you no problem.

Chevrolet... | Answered on May 23, 2018 | 45 views


It can be found in the instrument panel.

Chevrolet... | Answered on May 13, 2018 | 26 views


that depends if u have a 4l80 or a 4l60 need more info.

Chevrolet... | Answered on May 03, 2018 | 25 views

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