How To Service 4 Wheel Drive On 2008 Chevy Silverado 2500

Service 4 Wheel Bulldoze Message

Diagnose and ready Service 4 Bicycle Bulldoze Message

GM has issued a service bulletin # 09-04-21-001 to address a Service 4 Wheel Drive Message condition on the vehicles listed below. In improver to the Service four Wheel Bulldoze Bulletin, yous may also accept a C0387 or a C0569 problem lawmaking stored.

Vehicles with Service iv Bicycle Bulldoze Message and service bulletin

2009 Cadillac Escalade Hybrid

2007–2009 Chevrolet Barrage, Silverado, Silverado Hybrid, Suburban, Tahoe, Tahoe Hybrid

2007–2009 GMC Sierra, Sierra Hybrid, Yukon, Yukon Hybrid, Yukon Xl

All Equipped with Transfer Example RPO NQF or NQH

Transfer case won't shift

When the problem codes are stored and the Service 4 Wheel Drive Bulletin is displayed, the transfer case is inoperative for the rest of that particular primal cycle. It volition test again and reset the message on the side by side fundamental cycle if the problem hasn't been fixed. The codes may be stored with or without you requesting a transfer example shift. The codes and message may also be gear up during normal driving weather condition in Car 4WD, 4HI or 4LO.

The trouble codes often set intermittently gear up during extreme common cold or warm weather condition, or when the battery has a low accuse.

Crusade of Service 4 Wheel Drive message

GM has issued a software update to right the problem. DO NOT supplant the Transmission case control module TCCM. After reprogramming with the almost current update, perform a Clutch Reset Process (Motor Acquire Procedure). Also, if you lot accept C0387, C0387 or C0569 stored, cheque the transfer example electric connectors and wiring.

What is trouble lawmaking C0387

C0387 Unable to Consummate Shift Circuit

The transfer case encoder motor is a bi-directional DC motor. When Service 4 Wheel Drive energized through motor command A or motor control B, the ground connectedness is provided by the opposing motor control circuit, which is then grounded through the transfer instance command module (TCCM) ground circuit. The transfer case motor rotates the actuator shaft which moves the transfer case two/four wheel drive actuator cam and transfer example high/depression shift fork to shift the transfer case between the following modes or ranges: 2 HI, 4WD HI, 4WD LOW, Neutral

The transfer example command module monitors the actuator electric current and sensor output to verify the proper position has been obtained. Deviations in current and position from expected values volition cause this DTC to set if the ignition is ON and the system battery voltage is betwixt 10.five–eighteen 5.

Transfer case clutch reset procedure

ane. The key must be in the OFF position for at least 30 seconds.

2. Engage parking restriction.

3. Place transmission in Neutral.

4. Plow the key to the ACCESSORY position

5. Plow the transfer example shift command switch (TCSCS) to the 2WD HI position for at to the lowest degree 5 seconds.

6. Turn the TCSCS clockwise by the 4WD LO position to the neutral request position and hold for at least 30 seconds.

7. An audible noise from the transfer instance encoder motor should occur indicating asuccessful larn procedure.

This procedure applies to other vehicles with the NQH MP3023/iv Transfer Case.

2007-09 Chevrolet Barrage

2007-09 Chevrolet Silverado

2007-09 Chevrolet Suburban

2007-09 Tahoe

2007-12 Sierra

2007-09 Yukon

Posted on November 21, 2017 by Rick Muscoplat