Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

I took my truck over to my buddys shop today to have the…

Customer Question
i took my truck over...
i took my truck over to my buddys shop today to have the codes brought up on his scanner. my four wheel drive stopped working .i have replaced the shift motor and the switch and still nothing, the codes are B0790-06 B2725-08 and C0387-59 can you give me any insight as to where my problem could be next ?
Submitted: 2 years ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 15 minutes by:
1/21/2016
Chevy Mechanic: Reggie Whiddon,
 replied 2 years ago
Reggie Whiddon
Category: Chevy
Satisfied Customers: 167
Experience: Lead tech at river regions auto
Verified

our-Wheel Drive Does Not Engage

Circuit Description

The front axle control circuit consists of an electric motor actuator which engages and disengages the front axle. The front axle actuator consists of the following components within the actuator assembly:

  • A permanent magnetic motor
  • A worm gear controlled plunger
  • A front axle switch
  • An electronic control circuit

The front axle actuator consists of the following circuits:

  • An ignition 3 voltage circuit
  • A ground circuit
  • An axle actuator control circuit
  • An axle switch signal circuit

Whenever a shift to 4WD is selected, the transfer case switch engages the front axle by grounding the axle actuator control circuit.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Tests for proper ignition 3 voltage to the front axle actuator.

  1. Tests for proper ground at the front axle actuator.

  1. Tests for proper ground at the axle actuator control circuit through the transfer case switch.

  1. Tests the transfer case switch ground circuit for an open.

  1. Tests the transfer case switch for proper operation.

Step

Action

Values

Yes

No

Schematic Reference:Transfer Case Control Schematics

1

Did you perform a Diagnostic System Check – Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn OFF the ignition.
  2. Disconnect the front axle actuator.
  3. Ensure the 4-wheel drive (4WD) control lever is in the 4WD position.
  4. Turn ON the ignition with the engine OFF.
  5. With a DMM, test the ignition 3 voltage circuit for proper voltage.

Does the voltage measure within the specified value?

9–14 V

Go to Step 3

Go to Step 7

3

  1. Disconnect the front axle actuator.
  2. Turn ON the ignition, with the engine OFF.
  3. With a DMM, measure the voltage between the ignition 3 voltage circuit and the ground circuit at the front axle actuator.

Does the voltage measure within the specified value?

9–14 V

Go to Step 4

Go to Step 8

4

  1. Turn ON the ignition, with the engine OFF.
  2. Shift the transfer case into 4HI.
  3. Connect a test lamp between the ignition 3 voltage circuit and the axle actuator control circuit, at the front axle actuator.

Does the test lamp illuminate?

Go to Step 11

Go to Step 5

5

  1. Disconnect the transfer case switch.
  2. Connect a test lamp from the ignition 3 voltage circuit to the transfer case switch ground circuit

Does the test lamp illuminate?

Go to Step 6

Go to Step 9

6

With the control lever in the 4WD position, test for continuity across the transfer case switch.

Is continuity present across the switch?

Go to Step 10

Go to Step 12

7

Repair the open in the ignition 3 voltage circuit. Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

Go to Step 13

8

Repair the open in the ground circuit. Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

Go to Step 13

9

Repair the open in the transfer case switch ground circuit. Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

Go to Step 13

10

Repair the open in the axle actuator control circuit. Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

Go to Step 13

11

Replace the front axle actuator. Refer to Front Drive Axle Actuator Replacement.

Did you complete the replacement?

Go to Step 13

12

Replace the transfer case switch. Refer to Transfer Case Gear Indicator Switch Replacement.

Did you complete the repair?

Go to Step 13

13

Operate the vehicle in order to determine if the symptom has been corrected.

Is the symptom still present?

Go to Step 2

System OK

"Portions of materials contained herein have been reprinted with permission of General Motors Corporation, Service and Parts Operations" License Agreement #0410810.

Copyright 2007 - 2012 Service Repair Solutions, Inc.

Ask Your Own Chevy Question
Chevy Mechanic: Reggie Whiddon,
 replied 2 years ago

9-04-21-001: SERVICE*****MESSAGE - DTC C0387, C0569 SET (REPROGRAM TRANSFER CASE CONTROL MODULE) (MAY 19, 2009)

Subject:Service*****Message - DTC C0387 C0569 Set (Reprogram Transfer Case Control Module)

Models:2009 Cadillac Escalade Hybrid
2007–2009 Chevrolet Avalanche, Silverado, Silverado Hybrid, Suburban, Tahoe, Tahoe Hybrid
2007–2009 GMC Sierra, Sierra Hybrid, Yukon, Yukon Hybrid, Yukon XL
All Equipped with Transfer Case RPO NQF or NQH

Condition

Some customers may comment that the Service*****message is displayed. This may be the result of setting DTC C0387 or DTCs C0387 and C0569. When the code is current, the transfer case system remains inoperative for the rest of the ignition key cycle. For RPO NQF vehicles, both C0387 and C0569 may be set together with or without requesting a transfer case shift. For RPO NQH vehicles, the C0387 may be set when requesting a transfer case mode or range shift. On RPO NQH transfer cases, these DTCs can also be set during normal driving conditions in Auto 4WD, 4HI or 4LO. These DTCs may intermittently set during extreme cold or warm weather, or periods of lower than normal battery charge.

Cause

The Service*****message and the resulting DTC(s) set is a result of the Transfer Case Control Module (TCCM) software not updated to the latest version.

Correction

Important: DO NOT replace the TCCM for this condition.

Reprogram the TCCM with the revised calibration and then perform the Clutch Reset Procedure (Motor Learn Procedure).

Important: If DTC C0387 or DTCs C0387 and/or C0569 occur, check connectors and wiring, and service as necessary prior to reprogramming the TCCM.

Important: A voltage of 10.5 or higher is required to successfully complete the Clutch Reset Procedure without setting DTCs.

  1. Reprogram the TCCM with the latest software calibration.

    Important: Select the correct calibration files for the appropriate vehicle configuration (body style) and RPO codes.

    A revised calibration has been developed to address this condition. Technicians are to reprogram the TCCM using the Service Programming System (SPS) with the latest software available on TIS2WEB. Refer to Transfer Case Shift Control Module Programming and Setup procedures in SI. As always, make sure your Tech 2® is updated with the latest software version.

  2. Perform the Clutch Reset Procedure (Motor Learn Procedure). Refer to Transfer Case High/Low Clutch Reset in SI.
  3. Read and clear all the DTCs.
  4. Perform the following mode and range shifts: 2HI - 4HI, 2HI - 4LO, 2HI - Neutral.
  5. Test drive the vehicle. Use all modes, including 'Auto' mode for RPO NQH vehicles.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

K4121

Transfer Case Shift Control Module Reprogramming with SPS

0.4 hr

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

Copyright General Motors Corporation.

Portions of materials contained herein are sourced from General Motors Inc., Co.

Ask Your Own Chevy Question
Chevy Mechanic: Reggie Whiddon,
 replied 2 years ago

Transfer Case Control Module (TCCM)

- Vechicle stuck in*****when it does it locks front diff and is hard to turn on paved roads. Reflased with tech2 per bulletin 09 21 001 and fix it.

Programmed Transfer Case Control Module (TCCM)2Pino Mercuri
August 20, 20122007 GMC Sierra 1500, SLE 5.3L, V8, Gas, VIN J, Des LY5, 16V, USA *
Transfer Case Control Module (TCCM)

- we replaced the transfer case control module the vehicle is dowm the road everthing is runnining fine

Replaced Transfer Case Control Module (TCCM)3John Brinker
December 11, 20122007 Chevrolet Silverado 1500, LTZ 5.3L, V8, Gas, VIN M, 16V, USA *
Transfer Case Control Module (TCCM)

- No communication with transfer module. Unplugged it, plugged it back in, all is well.

Reset Transfer Case Control Module (TCCM)4Justin Nicholson
February 7, 20132007 Chevrolet Silverado 1500, LTZ 5.3L, V8, Gas, VIN M, 16V, USA *
Transfer Case Control Module (TCCM)

- replaced TCCM and programmed with Tech II then performed ATC motor relearn

Replaced Transfer Case Control Module (TCCM)5Rick Korgel
November 13, 20122011 Chevrolet Silverado 1500, LT 5.3L, V8, Flex, VIN 3, Des LC9, 16V, OHV, USA *
Transfer Case Control Module (TCCM)

- Had code C0387-sent to dealer for TCCM reflash-has factory warranty.

Replaced Transfer Case Control Module (TCCM)6Al Smirnov
March 12, 20152008 Chevrolet Avalanche, LTZ 5.3L, V8, Flex, VIN 3, Des LC9, USA *
Transfer Case Control Module (TCCM)

- had to replace B C M and tccm to program and repair

Replaced Transfer Case Control Module (TCCM)7Tim Cooley
December 30, 20142009 GMC Yukon, SLE 5.3L, V8, Flex, VIN 0, Des LMG, USA *
Transfer Case Control Module (TCCM)

- Reprogrammed Transfer case control module (TCCM)

Replaced Transfer Case Control Module (TCCM)8EcclesAuto1
August 1, 20132007 GMC Sierra 1500, SLE 5.3L, V8, Gas, VIN M, 16V, USA *
Transfer Case Control Module (TCCM)

- Reflash the TCCM per GM bulletin 09-04-21-001.

Programmed Transfer Case Control Module (TCCM)9Brent Gerry
April 7, 20152009 Chevrolet Suburban 1500, LTZ 5.3L, V8, Flex, VIN 3, Des LC9, USA *
Transfer Case Control Module (TCCM)

- The module requires programing by dealer.

Replaced Transfer Case Control Module (TCCM)10(+) 11-36QUATMAN02
December 10, 20142008 Chevrolet Suburban 1500, LT 5.3L, V8, Flex, VIN 3, Des LC9, USA *
Transfer Case Control Module (TCCM)

- REFLASH TCCM, INSTALLED NEW MODE SWITCH

Programmed Transfer Case Control Module (TCCM)1Mark Mabee
November 17, 20142007 Chevrolet Avalanche, LTZ 5.3L, V8, Flex, VIN 3, Des LC9, USA *
Transfer Case Shift Control Module Reprogramming

- Reset does not always work. You must start the truck and shift from P - N works great.

Performed Transfer Case Shift Control Module Reprogramming2GREENTIRE1
August 10, 20152008 Chevrolet Suburban 1500, LT 5.3L, V8, Flex, VIN 3, Des LC9, USA *
Transfer Case Shift Control Module Reprogramming

- just a simple reprogramming took care of it.

Performed Transfer Case Shift Control Module Reprogramming3Rod Ellingson
October 7, 20142010 Chevrolet Silverado 1500, LT 5.3L, V8, Flex, VIN 0, Des LMG, 16V, OHV, USA *
Transfer Case Shift Control Module Reprogramming

- reflash transfer case control module

Performed Transfer Case Shift Control Module Reprogramming

4Barry Martin
November 11, 20152008 Chevrolet Suburban 1500, LT 5.3L, V8, Flex, VIN 3, Des LC9, USA *
Transfer Case Shift Control Module ReprogrammingPerformed Transfer Case Shift Control Module Reprogramming

5Howie Farr
September 24, 20152008 Chevrolet Silverado 1500, LT 5.3L, V8, Flex, VIN 0, Des LMG, 16V, USA *
Transfer Case Shift Control Module ReprogrammingPerformed Transfer Case Shift Control Module Reprogramming

6Frank Coviello
September 4, 20152008 Chevrolet Suburban 1500, LTZ 5.3L, V8, Flex, VIN 0, Des LMG, USA *
Transfer Case Shift Control Module ReprogrammingPerformed Transfer Case Shift Control Module Reprogramming

7Gerry Schomisch
July 18, 20152009 Chevrolet Silverado 1500, LT 5.3L, V8, Flex, VIN 0, Des LMG, 16V, USA *
Transfer Case Shift Control Module ReprogrammingPerformed Transfer Case Shift Control Module Reprogramming

8Jeff Hovey
July 16, 20152009 Chevrolet Silverado 1500, LT 5.3L, V8, Flex, VIN 0, Des LMG, 16V, USA *
Transfer Case Shift Control Module ReprogrammingPerformed Transfer Case Shift Control Module Reprogramming

9Scott Keyser
June 8, 20152008 Chevrolet Silverado 1500, LT 5.3L, V8, Flex, VIN 3, Des LC9, 16V, USA *
Transfer Case Shift Control Module ReprogrammingPerformed Transfer Case Shift Control Module Reprogramming

10(+) 11-12Chip Mcnichols
April 2, 20152007 Chevrolet Silverado 1500, Classic LT 5.3L, V8, Gas, VIN B, 16V, USA *
Transfer Case Shift Control Module ReprogrammingPerformed Transfer Case Shift Control Module Reprogramming

Ask Your Own Chevy Question
Chevy Mechanic: Reggie Whiddon,
 replied 2 years ago

Hi i am Reggie hope i didnt bomb you with to much info there what i gave you is the test method right out of the factory service manual, and then i included a bulletin that is out addressing the issue your having, and I included couple of pages of failure records with confirmed repairs of vehicles like yours with same complaint. From what your describing i would recommend you get the reflash and clutch pack reset.

Ask Your Own Chevy Question
Was this answer helpful?
Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15,529
15,529 Satisfied Customers
Experience: GM Grand Master Technician 2007. 14 years experience.

GM Tech (Cam) is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,529 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,357 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,866 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,918 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,734 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
I drive a 4 cyl 2011 chevy equinox and the P symbol that is
I drive a 4 cyl 2011 chevy equinox and the P symbol that is on when I park has started flashing when I drive … read more
GM Bob
GM Bob
Automobile Technician
High School or GED
1,035 satisfied customers
2007 chev hhr power steering assist light comes on & power
2007 chev hhr power steering assist light comes on & power steering is gone. Shut off car & start up steering is ok for awhile,time varies. Have replaced both applicable fuses,what now?… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
95 6.5 diesel. Engine won't start. Glow plug light, water in
95 6.5 diesel. Engine won't start. Glow plug light, water in fuel light. Throttle service light. Service engine light isn't coming on. … read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
570 satisfied customers
2007 chevy malibu with 4 cylinder, goes into reduced power
2007 chevy malibu with 4 cylinder, goes into reduced power mode … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
I have several codes - related to ignition/fuel. I have two
I have several codes - related to ignition/fuel. I have two or three unrelated to those (brakes,etc). I will list the codes related to ign/fuel/electronics: 1. P0098 - Intake Air Sensor 2 Current High… read more
GM Bob
GM Bob
Automobile Technician
High School or GED
1,035 satisfied customers
I Would Like to get a Vin Build Sheet for my new 2017
I Would Like to get a Vin Build Sheet for my new 2017 Silverado … read more
GM Bob
GM Bob
Automobile Technician
High School or GED
1,035 satisfied customers
I have a 2010 Chevy Colorado that intermittently runs rough
I have a 2010 Chevy Colorado that intermittently runs rough and stalls out when idling at a red light or stop sign. About six months ago I had a rebuilt engine (Vortec 3700 I5) put in it and the mecha… read more
Mechanic01
Mechanic01
2,586 satisfied customers
Can not get air our of the front brake to work break flued
can not get air our of the front brake to work break flued is coming out when bleeding them … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
2005 silverado wont shift into 3rd. changed the shift
hi. 2005 silverado wont shift into 3rd. changed the shift solenoid A and B but still having the same problem. thinking it might be the pressure control solenoid or the torque converter clutch solenoid… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Can you please provide the removal and replacement
Can you please provide the removal and replacement procedures for the injector in my previous question? Thanks!… read more
Eric
Eric
Auto Technician
589 satisfied customers
We reflash Pcm, with J2534 SPS 2005 chevy silverado, with
we reflash Pcm, with J2534 SPS 2005 chevy silverado, with new calibration, SOFtWARE shows no fails, then try to CKP RELEARN, throtle bosy wnt WOT, then message engine reduce power, dtc U0107, we clear… read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
570 satisfied customers
I have a 2005 Chevy Malibu LT 3.5L V6. For the last week my
I have a 2005 Chevy Malibu LT 3.5L V6. For the last week my steering has seemed off. It seems to be lighter to the touch as in looser. When making a sharp left hand U-turn in a parking lot it felt lik… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
My 2003 chevy tracker stalls once it gets warm then won't
my 2003 chevy tracker stalls once it gets warm then won't start again till it cools down. … read more
Anthony P.
Anthony P.
high school
338 satisfied customers
I have a 2015 Chevy Malibu with a weak charging system,
I have a 2015 Chevy Malibu with a weak charging system, battery tested good but alternator putting out 12.5 volts. I replaced the alternator but the system still charging only 13.2 volts. Why is this … read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
I am changing out the canister vent valve on my 2007 Impala.
I am changing out the canister vent valve on my 2007 Impala. I live in the rust belt. The only screw that I need to remove is rusted. It is a 10mm. If I cannot get it after I hit it with PB Blaster, h… read more
Joecamel90
Joecamel90
Technician
Associate Degree
24 satisfied customers
I have a 2011 chevy tahoe. I replaced the battery and now
I have a 2011 chevy tahoe. I replaced the battery and now the rear AC only blows hot air. How can i reset it to blow cold air again? … read more
kwiggins29059
kwiggins29059
Associate Degree
219 satisfied customers
Reduced power message on engine start - every week or so.
Reduced power message on engine start - every week or so. Changed gas pedal & connector. Still an issue. … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
I just discovered I have an open on c2 pcm connector pin 20.
I just discovered I have an open on c2 pcm connector pin 20. Suspect rodent chewed thru wire. no speedo, have abs and brke warning on dash. shift in lockout. going to run new wire to vss. … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x