2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 969

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 969

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC C12F7

- ABS Boost Pressure Sensor and Regenerative Axle Pressure Sensor Not Plausible

DTC C128F

- ABS Regenerative Axle Pressure Sensor Raw Offset Error

DTC C012C 01

- Regenerative Axle Pressure Sensor Short to Battery

DTC C12BA

- ABS Regenerative Axle Pressure Sensor Circuit Short To Battery

DTC C012C 06

- Regenerative Axle Pressure Sensor Short to Ground or Open

DTC C12B9

- ABS Regenerative Axle Pressure Sensor Circuit Open or Short To Ground

DTC C012C 11

- Regenerative Axle Pressure Sensor Above Maximum Threshold

DTC C128C

- ABS Regenerative Axle Pressure Sensor Offset Error

DTC C012C 0F

- Regenerative Axle Pressure Sensor Erratic

DTC C12BB

- ABS Regenerative Axle Pressure Sensor Erratic

DTC C121A

- ABS Regenerative Axle Pressure Sensor

Circuit/System Description

The electronic brake control module (EBCM) uses input from the regenerative axle pressure sensor for more accurate control during a brake and

vehicle stability enhancement system (VSES) event. The regenerative axle pressure sensor is internal to the brake pressure modulator valve

assembly.

Conditions for Running the DTC

* Ignition ON.

* Ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

C128F, C12F7, C121A, C012C 11 or C128C

Internal sensor failure is detected.

C012C 01 or C12BA

A short to battery is detected on the sensor signal circuit.

C012C 06 or C12B9

A short to ground or open is detected signal circuit.

C012C 0F or C12BB

Signal is erratic and changes faster than physically allowed.

Action Taken When the DTC Sets

A DIC message and/or a warning indicator may be displayed.

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 896

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 896

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC C0299 00

- Brake Booster Performance

DTC C12FF 00

- EBCM Internal Malfunction

DTC C0299 31

- Brake Booster Performance General Checksum Failure

Circuit/System Description

The electronic brake control module (EBCM) uses input from the brake master cylinder piston position sensor and the brake switch to determine

when the brake pedal is being applied and with how much force. These inputs are used to determine the driver's braking intent which is used to the

control amount of pressure applied to the wheels.

Conditions for Running the DTC

* Ignition ON.

* The ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

* The brake pedal is sensed as applied for 6 minutes.

* The vehicle speed is greater than 21 km/h (13 mph).

Action Taken When the DTC Sets

* The EBCM disables the antilock brake system (ABS), traction control and the vehicle stability enhancement system for the duration of the

ignition cycle.

* A driver information center message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.

* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Reference Information

Schematic Reference

Antilock Brake System Schematics (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and Operation/ABS

Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Note: The battery must be able to maintain a charge during this procedure. It is recommended that a charger/maintainer or equivalent be used to

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 883

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 883

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC C0880 00

- Device Voltage Reference Output Circuit

DTC C12E5 00

- Brake Pedal Position Sensor Reference Circuit

DTC C0880 02

- Device Voltage Reference Output Circuit Short to Ground

DTC C120F 00

- Device Voltage Reference Output Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The electronic brake control module (EBCM) supplies a shared 5 volt reference to the brake master cylinder piston position sensor, steering angle

sensor and brake master cylinder piston position sensor.

Conditions for Running the DTC

* Ignition ON.

* The ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

The EBCM detects the voltage on the 5 V reference circuit to the brake master cylinder piston position sensor, steering angle sensor and brake

master cylinder piston position sensor is less than 4.8 V or greater than 5.2 V.

Action Taken When the DTC Sets

* The EBCM disables the antilock brake system (ABS), traction control and the vehicle stability enhancement system for the duration of the

ignition cycle.

* A driver information center message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.

* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Reference Information

Schematic Reference

Antilock Brake System Schematics (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 258

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 258

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B0158 02

- Outside Air Temperature Sensor Circuit Short to Ground

DTC B0158 05

- Outside Air Temperature Sensor Circuit Short to Battery or Open

DTC B0163 02

- Passenger Compartment Temp Sensor 1 Circuit Short to Ground

DTC B0163 05

- Passenger Compartment Temp Sensor 1 Circuit Short to Battery or Open

DTC B0168 02

- Passenger Compartment Temp Sensor 2 Circuit Short to Ground

DTC B0168 05

- Passenger Compartment Temp Sensor 2 Circuit Short to Battery or Open

DTC B0173 02

- Output Air Temperature Sensor 1 Circuit Short to Ground

DTC B0173 05

- Output Air Temperature Sensor 1 Circuit Short to Battery or Open

DTC B0178 02

- Output Air Temperature Sensor 2 Circuit Short to Ground

DTC B0178 05

- Output Air Temperature Sensor 2 Circuit Short to Battery or Open

DTC B0509 02

- Output Air Temperature Sensor 3 Circuit Short to Ground

DTC B0509 05

- Output Air Temperature Sensor 3 Circuit Short to Battery or Open

DTC B0514 02

- Output Air Temperature Sensor 4 Circuit Short to Ground

DTC B0514 05

- Output Air Temperature Sensor 4 Circuit Short to Battery or Open

DTC B3578 02

- Output Air Temperature Sensor 6 Circuit Short to Ground

DTC B3578 05

- Output Air Temperature Sensor 6 Circuit Short to Battery or Open

DTC B3583 02

- Output Air Temperature Sensor 7 Circuit Short to Ground

DTC B3583 05

- Output Air Temperature Sensor 7 Circuit Short to Battery or Open

Diagnostic Fault Information

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 3133

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 3133

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC U2142 00

- Lost Communication With Yaw Rate Sensor (YRS)

Circuit/System Description

Modules connected to the CAN bus serial data circuits monitor for serial data communications during normal vehicle operation. Operating

information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be

exchanged on the serial data circuits. The messages are supervised and also, some periodic messages are used by the receiver module as an

availability indication of the transmitter module. Each message contains the identification number of the transmitter module.

The electronic brake control module (EBCM) activates the other modules connected to the CAN serial data circuits by applying voltage when the

ignition key is in ACC, ON or START. The EBCM, Yaw Rate and Lateral Acceleration Sensor are the only modules connected to the CAN bus

serial data circuits. For more information on CAN bus serial data refer to Data Link Communications Description and Operation (See: Powertrain

Management/Computers and Control Systems/Information Bus/Description and Operation).

Conditions for Running the DTC

* The system voltage is between 9-16 volts.

* The vehicle power mode master requires serial data communication to occur.

Conditions for Setting the DTC

A supervised periodic message that includes the transmitter module availability has not been received.

Action Taken When the DTC Sets

* The vehicle stability enhancement system (VSES), if equipped, and traction control system (TCS) will not function.

* System OFF lamps will illuminate for these systems.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

* Sometimes, while diagnosing a specific customer concern or after a repair, you may notice a history U-code present. However, there is no

associated "current" or "active" status. Loss-of- communication U-codes such as these can set for a variety of reasons. Many times, they are

transparent to the vehicle operator and technician, and/or have no associated symptoms. Eventually, they will erase themselves automatically

after a number of fault-free ignition cycles. This condition would most likely be attributed to one of these scenarios:

- A control module on the data communication circuit was disconnected while the communication circuit is awake.

- Power to one or more modules was interrupted during diagnosis.

- A low battery condition was present, so some control modules stop communicating when battery voltage drops below a certain threshold.

- Battery power was restored to the vehicle and control modules on the communication circuit did not all re-initialize at the same time.

- If a loss-of-communication U-code appears in history for no apparent reason, it is most likely associated with one of the scenarios above.

These are all temporary conditions and should never be interpreted as an intermittent fault, causing you to replace a part.

* A control module may have a U-code stored in history that does not require any repairs. Issues with late or corrupted messages between

control modules can be temporary with no apparent symptom or complaint; this does not mean the control module is faulty. Do not replace a

control module based only on a history U-code.

* Do not replace a control module reporting a U-code. The U-code identifies which control module needs to be diagnosed for a communication

issue.

* Communication may be available between the BCM and the scan tool with either the low or high speed GMLAN serial data system

inoperative. This condition is due to the BCM using both the low and high speed GMLAN systems.

* Use to determine if the module uses high or low speed GMLAN serial data communications.

* Some control modules may not have internal protection for specific control circuits and may open a B+ or ignition fuse. If a fuse is open and

the B+ or ignition circuit is not shorted to ground, ensure none of the control circuits are shorted to ground before replacing the control

module.

* This diagnostic can be used for any control module that is not communicating, regardless of the type of serial data circuit it is connected to,

providing the vehicle is equipped with the control module.