Question about 2001 Chevrolet Impala

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2001 impala ABS light stays on. Code scan shows "pump/motor". Is that same as a module or valve modulator?

2001 impala ABS light stays on. Code scan shows "pump/motor". Is that same as a module?

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Posted on Jun 02, 2009

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2 Answers

How to diagnose an ABS problem


You need to find out what code is stored in the ABS control module, if the light is on there is a DTC an the system is disabled ! Don't know if auto part stores can pull ABS codes or not , You'll have to check it out . Personally I say take it to a ASE certified repair shop if you don't know anything about anti lock brakes !
?€¢
Electronic Brake Control Module (EBCM) -- The EBCM controls the system functions and detects failures.


The EBCM contains the following components:


?€¢
System Relays -- The inlet and outlet solenoid relay is energized when the ignition is ON and no ABS DTCs are present. It supplies battery positive voltage to the solenoid valves, the pump motor relay is energized and supplies battery positive voltage to the pump motor when ABS is activated.


?€¢
Brake Pressure Modulator Valve (BPMV) -- The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The BPMV uses a 4 circuit configuration with a diagonal split. The BPMV directs fluid from the reservoir of the master cylinder to the left front and right rear wheels and fluid from the other reservoir to the right front and left rear wheels. The diagonal circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other.


This system can store 10-12 DTC's for something simple as wheel speed sensors to wiring problems to a malfunction of the EBCM . Some of these problems you would need a professional type scan tool ! The antilock brake system on your vehicle is the
BOSCH 8.0 antilock braking system
The vehicle is equipped with the following braking systems:
?€¢
Antilock Brake System (ABS)


?€¢
Dynamic Rear Proportioning (DRP)


?€¢
Traction Control System (TCS) (w/NW7)

The following components are involved in the operation of the above systems:
?€¢
Electronic Brake Control Module (EBCM) -- The EBCM controls the system functions and detects failures.


The EBCM contains the following components:


?€¢
System Relays -- The inlet and outlet solenoid relay is energized when the ignition is ON and no ABS DTCs are present. It supplies battery positive voltage to the solenoid valves, the pump motor relay is energized and supplies battery positive voltage to the pump motor when ABS is activated.


?€¢
Brake Pressure Modulator Valve (BPMV) -- The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The BPMV uses a 4 circuit configuration with a diagonal split. The BPMV directs fluid from the reservoir of the master cylinder to the left front and right rear wheels and fluid from the other reservoir to the right front and left rear wheels. The diagonal circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other.


Important: There is a rubber isolator located under the BPMV and on the mounting studs. The rubber isolators protect the BPMV and the EBCM from vehicle vibrations.


?€¢
The BPMV contains the following components:


-
Pump Motor


-
Inlet Valves (one per wheel)


-
Outlet Valves (one per wheel)


?€¢
Wheel Speed Sensors (WSS) -- As the wheel spins, the wheel speed sensor produces an AC signal. The EBCM uses this alternating current signal to calculate wheel speed. The wheel speed sensors are replaceable only as part of the wheel hub and bearing assemblies.


?€¢
Traction Control Switch (w/NW7) -- The TCS is manually disabled or enabled using the traction control switch.


?€¢
Stop Lamp Switch - The EBCM uses the stop lamp switch as an indication that the brake pedal is applied

Sep 21, 2015 | 2006 Saturn ION

3 Answers

What is the C0265 error code


The ABS EBCM anti-lock brake module is failing causing problems with the ABS pump running constantly, also will drain your battery.
  1. Remove the ABS fuse to prevent ABS motor burn out.
  2. You can still drive your vehicle with the module removed.
  3. We recommend covering the exposed surface of the hydraulic control unit with aluminum foil to keep out water and dirt.
Common Failures:
  • ABS Pump Always Running
  • Codes: C0265, C0267, C0268
  • Pump Motor Circuit trouble code
  • Power Relay trouble code
  • Valve Relay Trouble code
  • Dump Valves (solenoids) trouble codes
  • No Communication
  • Intermediate power loss
http://www.myairbags.com/dtc-code-c0265-abs-ebcm-light/
ebcm-abs-control-module-failure-code-dtc-c0265-c0267-c0268-pump-running-y52j5yjvtwyljepizajwhmfx-1-0.jpg

Nov 28, 2014 | 2001 GMC Sierra C3

1 Answer

AWD Disable light on 2001 Pontiac Aztec- how do I get if off?


Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

Oct 11, 2012 | 2001 Pontiac Aztek

1 Answer

2001 Nissan PAthfinder 4-wheel drive malfunctioning'


Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

Oct 11, 2012 | 2001 Nissan Pathfinder

1 Answer

ABS light went on while driving and noise stays on after ignition is turned off.


There is a relay inside of the ABS motor housing that can stay engaged making the motor run continuously without the key in the run position. If this is the problem the only fix is to replace the Brake Pressure Modulator Valve assembly. You may also may need to replace the Control Module that is attached to it.

The motor can be unplugged from the module and will shut off. The ABS light will stay on until it if fixed properly. The other way to shut down the motor is to remove the ABS fuse in the underhood fuse box.

The ABS module and BPMV are expensive and the brakes will have to be bled. Junk yard parts can be cheaper if your capable to replace them.

Jul 27, 2010 | 2002 Chevrolet Tahoe

1 Answer

My ABS light stays on what could this be ?


scan abs module and you will find a code 265..the internal relay has failed will need to replace abs module

Dec 27, 2009 | 2001 Chevrolet Silverado 1500

1 Answer

2001 Suburban ABS motor staying on after ignition is off


what you have is a ABS module that has shorted out internally. you have to replace that module and then bleed the ABS pump AND the brakes at all wheels.

Aug 13, 2009 | 2003 Chevrolet Suburban 1500

1 Answer

Abs light stays on


It is the abs modulator itself. They tend to have electronical problems. They can only be serviced by the dealer. I as a mechanic know from experience, that it cannot be self-adjusted or repaired.

Jun 02, 2009 | 2001 Chevrolet Impala

1 Answer

ABS light just came on, is it an easy fix. My abs warning light comes on often. It usually stays on until I restart the car, then it might stay off for days but will always relight. Often, I turn the...


The code scanner that you need is called ODBII code reader with ABS, and it works in the same way as the one that you connect to the car computer module (ECU) to read codes when the check engine light comes on, but the cheap ones that you can buy from $50 do not have the ABS brake scan function.

If the problem is the ABS, then it is often a wiring to abs problem, or a defective ABS control module, a scan reading is necessary to know what the problem is.

Below few examples of Code reader with ABS:

Equus 3150 Innova ABS + Professional CanOBD2 ...


$199.00 - Amazon.com


Cp9449 Brake Scan Abs Diagnostic Tool Obd2 ...


$219.67 - eBay


Equus 3160 Innova ABS + Professional CanOBD2 ... $259.99 - Amazon.com


CAN OBDII Code Reader with Multilingual Menu $49.99 - Harbor Freight Tools

Mar 24, 2009 | 2001 Chevrolet Blazer

3 Answers

Where is the abs control module located on a 02 chevy avalanche ?


THE EBCM IS BAD this is the electronic control module that is on abs pump. you can replace seperate I think it is around 500 for part

Dec 30, 2008 | 2002 Chevrolet Avalanche

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