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2009 Gmc 1500 "Service 4wd" light


shadow664

Question

Hello, So heres the story, I bought this truck used with 80000 kms on it this past june, It is a 2009 gmc 1500 slt 5.3(LH6)

 

Before i drove it off the lot, it had a service 4wd light come on, they brought it into the shop and couldnt find the codes, so i said i would bring it back if it happened again

 

so it only happened a few more times in the summer, but now winter has hit and it pretty much show's up everytime i start the truck. Some times if i restart the truck it disappears, sometimes i can pull the 4wd selector switch and unplug it and plug it back in and it works again

 

so when i finally had some days off that i could bring the truck into the gm dealer, they told me my bumper to bumper warranty has run out, now i just have drive train warranty left and this would not be covered

 

so then i brought it to my old place of work(Ok tire) and i used the code scanner and found

 

C0392 - Rotational Position Sensor Circuit Fault

 

B0790 - Transfer case Neutral Indicator Circuit

 

Does anyone have prior experience with this code, I have tried looking around for information about it, but couldnt find anything

 

So if anyone has had this code or knows what components might be at fault etc and if it should be covered under drive train warranty or anything like that

 

 

Thanks for all your help

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im only posting this for giggles ,but if its bought from a dealer and the light was on then ,ITS THEIR PROBLEM !!!!!

 

DTC C0392

 

Diagnostic Instructions

 

 

 

 

 

 

 

 

 

DTC Descriptors

DTC?C0392?01: Rotational Position Sensor Circuit Short to Battery DTC?C0392?02: Rotational Position Sensor Circuit Short to Ground DTC?C0392?08: Rotational Position Sensor Circuit Signal Invalid

Diagnostic Fault Information

 

Circuit

 

 

 

Short to Ground

 

 

 

Open/High Resistance

 

 

 

Short to Voltage

 

 

 

Signal Invalid

 

 

 

Rotational Position Sensor Circuit

 

 

DTC C0392?02

 

 

DTC C0392?08

 

 

DTC C0392?01

 

 

DTC C0392?08

 

 

5-Volt Reference

 

 

DTC C0392?02

 

 

DTC C0392?08

 

 

DTC C0392?01

 

 

DTC C0392?08

 

 

Low Reference

 

 

 

 

DTC C0392?08

 

 

 

 

DTC C0392?08

 

Circuit/System Description

 

The transfer case shift control module (TCCM) receives input from the transfer case two/four wheel drive actuator position sensor, also known as the rotational position sensor (RPS). The RPS receives a 5-volt reference signal from the TCCM. In return the RPS sends the TCCM a variable pulse width modulated signal indicating the position of the transfer case actuator. The RPS works in conjunction with the incremental position sensor, inside the transfer case actuator, to confirm actuator position. The RPS is more sensitive than the incremental position sensor and is able to indicate to the TCCM the exact position of the transfer case actuator between mode or range changes. It is also able to show how much clutch activation is being commanded at any time.

Conditions for Running the DTC

 

 

 

 

 

 

Conditions for Setting the DTC

 

 

 

C0392?01

The TCCM sees an RPS-PWM voltage that does not constantly change, but remains high, >5.0?V, indicating a short to voltage.

 

 

C0392?02

The TCCM sees an RPS-PWM voltage that does not constantly change, but remains low, <0.5?V, indicating a short to ground.

C0392?08

 

 

 

 

 

 

Action Taken When the DTC Sets

 

Current Mode:

 

4WD?Auto, 4WD?HI or 4WD?LO

 

 

 

 

 

 

 

 

 

 

2WD?HI or Neutral

 

 

 

 

 

 

 

Mode/Range Shift

 

 

 

 

 

 

 

 

 

Conditions for Clearing the DTC

 

 

 

 

 

 

 

 

 

Diagnostic Aids

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference Information

 

Schematic Reference

 

Transfer Case Control Schematics

Connector End View Reference

 

Component Connector End Views

Electrical Information Reference

 

 

 

 

 

 

 

 

 

 

 

 

 

Scan Tool Reference

 

Control Module References for scan tool information.

Special Tools

 

 

 

 

 

 

 

 

 

Circuit/System Verification

 

 

 

 

 

 

 

 

 

Circuit/System Testing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Component Testing

 

RPS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TCCM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<a href="http://gsi.xw.gm.com/newsi/showDoc.do?docSyskey=1912825&cellId=161474&pubObjSyskey=5351453&from=sm&pubCellSyskey=1257798&deliveryEffectiveDate=Nov+1%2C+2012#N66421">

Repair Instructions

 

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

 

Control Module References for TCSCM replacement, setup, and programming

 

 

 

 

 

 

 

 

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DTC B0790

 

Diagnostic Instructions

 

 

 

 

 

 

 

 

 

DTC Descriptor

DTC B0790?01: Neutral Indicator Circuit Short to Battery DTC B0790?06: Neutral Indicator Circuit Short to Ground or Open

Diagnostic Fault Information

 

 

Circuit

 

 

 

Short to Ground

 

 

 

Open/High Resistance

 

 

 

Short to Voltage

 

 

 

Ignition?1 Voltage

 

 

B0790?06

 

 

B0790?06

 

 

 

 

Neutral Indicator Circuit

 

 

B0790?06

 

 

B0790?06

 

 

B0790?01

 

Circuit/System Description

 

The neutral indicator circuit consists of a light emitting diode (LED), a LED feed circuit and a LED control circuit. The ignition?1 voltage circuit is the LED feed circuit and continuously supplies voltage to the Neutral LED. When the Neutral mode has been selected by the driver, the transfer case shift control module (TCCM) provides a ground through the neutral indicator control circuit illuminating the LED. The TCCM tests the neutral indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the ignition?1 voltage circuit by grounding the neutral indicator control circuit for 2?seconds during the bulb?test at key ON.

Conditions for Running the DTC

 

B0790?01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B0790?06

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Conditions for Setting the DTC

 

B0790?01

The TCCM detects 3.4?V or greater on the AWD indicator control circuit when the neutral indicator is commanded ON.

 

B0790?06

The TCCM detects 1.6?V or less for 1.5?seconds on the AWD indicator control circuit when the neutral indicator is commanded OFF.

Action Taken When the DTC Sets

 

Normal operation, the SERVICE?4WD indicator is commanded ON for the remainder of the ignition cycle. Driver is also informed of fault via bulb check.

Conditions for Clearing the DTC

 

 

 

 

 

 

 

 

 

Diagnostic Aids

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference Information

 

 

Schematic Reference

 

Transfer Case Control Schematics

 

Connector End View Reference

 

Component Connector End Views

 

Electrical Information Reference

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Scan Tool Reference

 

Control Module References for scan tool information.

 

Special Tools

 

 

 

 

 

 

 

 

 

Circuit/System Verification

 

Key ON, engine OFF. The TCCM runs a 2?second bulb test on all indicators of the TCSCS at key ON.

Circuit/System Testing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Component Testing

 

BCM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TCCM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mode

 

 

 

2 High

 

 

 

4 High

 

 

 

4 Low

 

 

 

N

 

 

 

5-V Reference (pin)

 

 

11

 

 

11

 

 

11

 

 

11

 

 

Indicator Control Circuit (pin)

 

 

7

 

 

9

 

 

10

 

 

3

 

 

TCSCS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EL49741 Wire Color

 

 

 

2 High

 

 

 

4 High

 

 

 

4 Low

 

 

 

N

 

 

 

Red – pin

 

 

4

 

 

4

 

 

4

 

 

2

 

 

Black – pin

 

 

7

 

 

9

 

 

10

 

 

3

 

<a href="http://gsi.xw.gm.com/newsi/showDoc.do?docSyskey=1912754&cellId=161449&pubObjSyskey=3132122&from=sm&pubCellSyskey=1921067&deliveryEffectiveDate=Nov+1%2C+2012#N66628">

Repair Instructions

 

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

 

 

 

 

Control Module References for TCSCM replacement, setup, and programming

 

 

 

 

 

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