Question about 2001 Chevrolet Impala

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Abs light stays on

Could the pump/motor be a modulator valve?

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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.

Posted on Jun 02, 2009

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My abs and brake light stays on in my 2004 dodge ram 1500 5.7 litre 2WD, changed wheel sensor s & diff sensor, Abs pump doesn't kick on anymore, before it used to kick on and off, any ideas


Have it checked for DTC'S - diagnostic trouble codes . ABS and brake light on , codes are stored in the EBCM - electronic brake control module . Could be ABS relay , control module , pump motor and the only way to find out what the problem is , have checked for DTC'S

Jan 24, 2017 | Dodge Cars & Trucks

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

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

Have a 02'suberban and once the truck is off the ABS pump stays on.Why?


remove the ABS relay from the fuse box under the hood. This will shut the motor off. Then you will need to remove the ABS module and hve it rebuilt,
modulemaster.com can rebuild it for alot less than a dealer replacement. You can still drive the truck while the part is out for repairs. Just protect the connector and valve body by wrapping it up.

This is a very common symptom for a failed ABS module.

May 30, 2010 | Chevrolet C2500 Cars & Trucks

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 is on


Locate and pull the ABS pump fuse located in the power distribution center under the hood and CHECK IT TO SEE IF THE FUSE IS BAD. Basically you are looking for a fuse box with large amperage fuses and some relays. Look along the fender well in the engine compartment relatively close to the battery. It is a 60 amp fuse in most instances and should be clearly labeled "ABS" in the large fuse box with other similarly oversize fuses used for other high power subsystems. 
 All ABS systems are designed so that the solenoid valves in the ABS brake manifold are in safety "bypass" mode when powered down or when the ABS control module has been removed. You will have standard everyday power brakes no different than brakes built without the ABS system.

The ABS system will perform a self check once you exceed 5 MPH and the "ABS" and "brake" lamps should turn off. During this test, the controller runs the pump motor and briefly operates all of the valves. This ABS "self-test" is performed every time you start and drive.

EBCM is short for "Electronic Brake Control Module" It is the advanced computer than controls the electric motor pump and valves of your ABS system.  Burnout of the motor is very rare however. A MOSFET transistor in the EBCM (Electronic Brake Control Module) has failed, can cause the pump not to perform.

Pump motors generally do not fail, but when they do, the culprit is usually worn-out brushes or corroded electrical connections. In a worst-case scenario, your motor is beyond repair. It is bolted directly to the hydraulic assembly- a cast aluminum brake fluid distribution hub with 5 or 6 brake lines branching off of it and wiring harness.

I hope this helps before you get your hands to dirty. In short check all the electrical connections first. Try running a hot wire to the pump motor first to see if it runs and if it does, then it's not the motor and could be a easier fix by changing the (EBCM).

Apr 19, 2009 | 1998 Pontiac Trans

3 Answers

Warning lights staying on after engine started


probably the shuttle valve in the ABS unit is defective, solution renew shuttle valve, dont let dealership sell you a new ABS unit very expensive

Mar 08, 2009 | 2000 Land Rover Discovery

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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