# Service bulletin PIT4593D

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10112578
- Published by NHTSA: 2017\-08\-15
- Manufacturer's number: PIT4593D
- Manufacturer's date: 2012\-11\-15
- NHTSA component: SERVICE BRAKES, ELECTRIC; ELECTRICAL SYSTEM

## NHTSA's summary

This Preliminary Information communication provides information to the technician about vehicles that have a lack of brake assist after disconnecting the battery or after the 12 volts battery has run low on voltage. The Antilock Braking System Malfunction Indicator Lamp may also be on. Technician may find Diagnostic Trouble Code C121D sym 00 or C056D sym 00 set in the Electronic Brake Control Module. Technician should be advised to wait for a period of at least 1 minute with the ignition in the "OFF" position prior to disconnecting the negative battery cable. Technician will need to follow these steps to repair the concern. 1. Install the negative battery cable to the battery. 2. Rotate the lever lock clockwise until an audible click is heard in order to connect the negative battery cable to the battery. 3. Position the negative battery cable insulating cover over the negative terminal. 4. Start the vehicle without stepping on the brake pedal. 5. Shut the vehicle "Off" for one minute. 6. Restart vehicle and check brakes for proper operation. 7. Clear codes in the Engine Control Module and the Electronic Brake Control Module.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2012/MC-10112578-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2012/MC-10112578-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes, Electrical system

## Trouble codes named

C056D, C121D

## Vehicles listed

- 2009 to 2013 CADILLAC ESCALADE
- 2009 to 2013 CHEVROLET SILVERADO
- 2008 to 2013 CHEVROLET TAHOE
- 2009 to 2013 GMC SIERRA
- 2009 to 2013 GMC SIERRA DENALI
- 2008 to 2013 GMC YUKON
- 2008 to 2011 GMC YUKON XL
- 2012 to 2013 GMC YUKON XL

## Recalls for the same vehicles and component

- [2016597](/recalls/tc/2016597.md), 2016-11-29: Electrical
- [2015002](/recalls/tc/2015002.md), 2014-12-30: Electrical
- [14V827000](/recalls/nhtsa/14V827000.md), 2014-12-30: ELECTRICAL SYSTEM:IGNITION
- [2014432](/recalls/tc/2014432.md), 2014-10-03: Electrical
- [14V614000](/recalls/nhtsa/14V614000.md), 2014-10-01: ELECTRICAL SYSTEM
- [2014277](/recalls/tc/2014277.md), 2014-07-03: Electrical
- [14V407000](/recalls/nhtsa/14V407000.md), 2014-07-02: ELECTRICAL SYSTEM
- [10V240000](/recalls/nhtsa/10V240000.md), 2010-06-04: ELECTRICAL SYSTEM
- [08V441000](/recalls/nhtsa/08V441000.md), 2008-08-28: ELECTRICAL SYSTEM

## Other bulletins for the same vehicles and component

- [25\-NA\-087](/bulletins/11017595.md), 2025-05-02, Service bulletin: ELECTRICAL SYSTEM. This service bulletin provides information on the proper Reflective High Temperature Heat and/or Insulating Tape to use for certain repairs, such as Wiring Harness Repairs.
- [23\-NA\-001](/bulletins/11017252.md), 2025-04-28, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM. This service bulletin provides information for dealers/technicians on OnStar Module 2G Sunset Information.
- [13\-08\-116\-001K](/bulletins/11017244.md), 2025-04-25, Service bulletin: ELECTRICAL SYSTEM. The intent of this service bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them.
- [15\-06\-03\-001F](/bulletins/11017031.md), 2025-04-15, Service bulletin: ELECTRICAL SYSTEM. This service bulletin provides information to diagnose batteries that have set for a long period of time and/or cold weather climates and testing those batteries.
- [21\-NA\-043](/bulletins/11014230.md), 2025-02-12, Service bulletin: VISIBILITY/WIPER; SERVICE BRAKES; ENGINE; ELECTRICAL SYSTEM; WHEELS. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold \(prepping\) to the customer.
- [09\-06\-04\-026Z](/bulletins/11013069.md), 2025-01-23, Service bulletin: ENGINE; POWER TRAIN; ELECTRICAL SYSTEM. This bulletin provides information on identifying Non\-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
- [PIT5962B](/bulletins/11011805.md), 2024-12-12, Service bulletin: ELECTRICAL SYSTEM; UNKNOWN OR OTHER. This Preliminary information communicates a GM part number for reflective high temperature heat or insulating tape when repairing wiring harnesses.
- [21\-NA\-043](/bulletins/11011709.md), 2024-12-10, Service bulletin: STRUCTURE:BODY; WHEELS; ENGINE; SERVICE BRAKES; UNKNOWN OR OTHER. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold \(prepping\) to the customer.
- [20\-NA\-132](/bulletins/11010421.md), 2024-11-09, Service bulletin: ELECTRICAL SYSTEM. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
- [PIT5698E](/bulletins/11009170.md), 2024-10-25, Service bulletin: ELECTRICAL SYSTEM. This Preliminary information communicates additional information on how a LIN bus operates and diagnostic tips when working on a LIN bus.

JSON: [/v1/bulletins/10112578](/v1/bulletins/10112578)

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