Question about 2011 Ford Ranger

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DTC U0121 - Lost Communication With Anti-Lock Brake System (ABS) Control Module

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  • Ford Master
  • 354 Answers

If you clear the code does it come right back AND is the ABS light illuminated on dash?

Posted on Apr 19, 2014

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6ya6ya
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Posted on Jan 02, 2017

Am here
  • 36 Answers

SOURCE: anti-lock brake system and brake system lights

the indicater failed in ABS so you have to change the indicator in a authorised dealer

Posted on Aug 25, 2009

  • 114 Answers

SOURCE: When i brake at 50mph the vihicle shakes real bad

There are some driving tests you could try. If there is an ABS problem it is not common for the system to be effected by rotor temperatures, so if the shake comes & gets worse the more you brake than it is a rotor. 99% of the time a brake shake is a wharped rotor. Also, most of the time the brake pedal will get noticeably harder if the ABS is kicking in.
Try that

Posted on Sep 25, 2009

  • 101 Answers

SOURCE: changed back brake pads only, after, the anti-lock

either the system needs to be "reset" or you damaged a sensor during the process. Try removing a battery cable and leave it off for a couple minutes. reconnect the cable , start & drive... if light returns, need to visit your favorite mechanc for diagnosis

Posted on Oct 17, 2009

Testimonial: "very informative. great advice. thank you"

  • 454 Answers

SOURCE: red brake light and anitlock light come on when

Check brake fluid level.

Posted on Dec 04, 2009

frankgilbert
  • 613 Answers

SOURCE: 2005 Crow Victoria ABS light on, no communication

Could be contaminated fluid, bad switch....but try to unhook battery and wait 20 seconds and then rehook.

Posted on Nov 03, 2010

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1 Answer

U0121


it means that the engine computer has lost communication with the antilock brake controller (CAB) check the wiring. Disconnect the ABS module pigtail and inspect the pins. Look at wiring near the battery and see if acid has caused corrosion

May 17, 2014 | 2005 Dodge Dakota

1 Answer

ABS indicator lamp lights up and indicator km(in speedometre) is not lit


try pulling battery for ten minutes or so and see if that clears any of the codes if not use a obd11 code reader and that should give you a correct answer

Apr 22, 2014 | 2011 Ford Ranger

1 Answer

Dtc codes


Anti-Lock ControlPinpoint TestsPinpoint Test F: DTC C1266Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. See: Electronic Brake Control Module > Removal and Replacement > Anti-Lock Brake System (ABS) Module. TEST the system for normal operation.NoVERIFY BJB fuse 109 (20A) is OK. If OK, REPAIR circuit 483 (RD). If the fuse is not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. CLEAR the DTCs. TEST the system for normal operation. See: Vehicle > Electrical > Diagrams By Number------------------------------------------------- 7e31ae16-fdd7-4a46-aeb5-da4950e51178.jpg - - Disconnect: ABS Module C135. Measure the voltage between ABS module C135-25, circuit 483 (RD), harness side and ground.
if voltage is greater than 10 volts replace abs module if not
check fuse described in upper section if fuse is bad replace if it blows again you need to check wiring

Apr 21, 2014 | 2010 Ford Crown Victoria

1 Answer

2006 ford crown vic abs code b1596


B1596 ABS Module Service Continuous Codes NOTE: If other DTCs are present, REPAIR them before installing a new component.
TURN the ignition switch to the OFF position and wait at least 30 seconds. Turn the ignition switch to the ON position. REPEAT the ABS self-test. If any DTCs are retrieved, REFER to the Anti-Lock Brake System (ABS) Module Diagnostic Code (DTC) Index. If no DTCs are retrieved, CARRY OUT a drive test above 15 km/h (9 mph), then REFER to the symptom chart.
Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Index DTCs DTC Caused By Description Action B1342 ABS Module ECU is Defective INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. B1484 ABS Module Brake Pedal Input Open Circuit Go To Pinpoint Test D . B1596 ABS Module Service Continuous Codes NOTE: If other DTCs are present, REPAIR them before installing a new component.
TURN the ignition switch to the OFF position and wait at least 30 seconds. Turn the ignition switch to the ON position. REPEAT the ABS self-test. If any DTCs are retrieved, REFER to the Anti-Lock Brake System (ABS) Module Diagnostic Code (DTC) Index. If no DTCs are retrieved, CARRY OUT a drive test above 15 km/h (9 mph), then REFER to the symptom chart. B1676 ABS Module Battery Voltage Out of Range Go To Pinpoint Test E . C1145 ABS Module Speed Wheel Sensor RF Input Circuit Failure Go To Pinpoint Test B . C1155 ABS Module Speed Wheel Sensor LF Input Circuit Failure Go To Pinpoint Test B . C1165 ABS Module Speed Wheel Sensor RR Input Circuit Failure Go To Pinpoint Test B . C1175 ABS Module Speed Wheel Sensor LR Input Circuit Failure Go To Pinpoint Test B . C1222 ABS Module Speed Wheel Mismatch Make sure the tires are the same size and correctly inflated. INSPECT the wheel speed sensor rings. CLEAR the DTC. TEST drive the vehicle. REPEAT the self-test. C1266 ABS Module ABS Valve Power Relay Circuit Failure Go To Pinpoint Test K . C1296 ABS Module Wheel Speed LF Signal Fault Go To Pinpoint Test C . C1297 ABS Module Wheel Speed RF Signal Fault Go To Pinpoint Test C . C1298 ABS Module Wheel Speed RR Signal Fault Go To Pinpoint Test C . C1299 ABS Module Wheel Speed LR Signal Fault Go To Pinpoint Test C . C1300 ABS Module ABS Hydraulic Pump Motor Circuit Failure Go To Pinpoint Test A . C1805 ABS Module Mismatched PCM and ABS Modules Do Not Match CHECK the part numbers. INSTALL the correct module. C2775 ABS Module TC ON/OFF Switch Stuck Failure Go To Pinpoint Test H . U0073 CAN Bus Control Module Communication Bus Off REFER to Section 418-00 . U1900 CAN Bus CAN communication Bus Fault - Receive error REFER to Section 418-00 . U2023 CAN Bus Fault received from External Node REFER to Section 418-00 .

Jan 14, 2013 | 2006 Ford Crown Victoria

1 Answer

U0121


Hi there:
DTC U0121 - Lost Communication With Anti-Lock Brake System (ABS) Control Module


If the fault come back again, this is being caused by a failed ABS module. You will need to replace the module and run the verification process to correct your concern. To run the verification process you will need access to a full level scan tool (as factory scan).


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Jul 03, 2012 | 2005 Jeep Grand Cherokee

1 Answer

ABS LIGHT AND TRACTION CONTROL LIGHT STAYS ON


ABS = Anti-lock Brake System.
TC = Traction Control System (Engine Control Module).
If the ABS lights on the dashboard permanently the ABS system is faulty. You must access the ABS & TC Electronic Control Units (ECU) memory for pull out all DTC (Diagnostic Trouble Codes), using diagnostic equipment connected to the data link connector of the car. Then you will be full informed about bad pieces (e.g.: front right wheel abs sensor interrupted, ...). After bad pieces replacement you will be able to erase all faults memored by ABS ECU, in other words reset the ABS system and turn off the warning lamp on dashboard.

I suspect bad brake pedal switch, but you should scan the ABS & TC ECU's.

Jul 02, 2011 | 2001 Jaguar XJ8

2 Answers

My ABS light is on and off on a 2006 Mercury Mariner. Do I need to do something to get this light to stay off


SECTION 206-09: Vehicle Dynamic Systems 2006 Escape/Mariner/Escape Hybrid/Mariner Hybrid Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 03/29/2005 Anti-Lock Control adobe.gif Printable View (63 KB) The ABS consists of the following components:
  • Hydraulic control unit (HCU)
  • Anti-lock brake control module
  • Front and rear wheel speed sensors
  • Front and rear wheel speed sensor rings
  • Stability control sensor cluster
  • Stability/traction control switch
The ABS prevents wheel lock-up by monitoring the wheel speed sensors and actuating the HCU modulating the brake pressure to prevent wheel lockup. By preventing the wheels from locking up, the driver is able to maintain steering control and stop in the shortest possible distance under most conditions. The traction control system utilizes the same components as the ABS to prevent wheel spin and help maintain vehicle control during acceleration. The roll stability control (RSC) system utilizes the same components as the ABS and the traction control systems and also monitors the steering wheel position sensor and the stability control sensor cluster to assist in stabilizing the vehicle during abrupt maneuvers.
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The ABS module is self monitoring. The module will carry out a preliminary electrical check of the hydraulic pump motor by turning the pump ON for approximately 1/2 second either when the ignition switch is turned to the RUN position and the brake pedal is not pressed or when the vehicle is in motion and at vehicle speeds above 20 km/h (12 mph). The ABS module will also carry out a wheel speed sensor self-test by sending a reference voltage to all of the wheel speed sensors through their circuitry when the ignition switch is turned to the RUN position, with or without brake pedal application. If a malfunction is detected in the pump or wheel speed sensors, the ABS module will shut down and disable the anti-lock system. Normal power assisted braking, however, remains.
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Visual Inspection Chart
Mechanical Electrical

  • Base brake system
  • Brake booster vacuum hose
  • Hydraulic control unit (HCU)
  • Steering components and suspension components
  • Tire size
  • Wheel speed sensor ring
  • ABS module
  • Battery junction box (BJB) fuse(s):
    • 19 (40A)
    • 22 (40A)
  • Brake fluid level switch
  • Brake pressure transducer
  • Smart junction box (SJB) fuse(s):
    • 6 (15A)
    • 34 (5A)
  • Stoplamp switch
  • Wheel speed sensor
  • Wiring, terminals or connectors


You may need to have the dealer run a scan test to determine the DTC fault codes. Then go from there. Autozone can't read these codes as tehy are chassis codes. They only can read powertrain codes.

Good luck. please rate.

Jan 25, 2011 | Mercury Mariner Cars & Trucks

1 Answer

ABS brake module sounds like a motor running and won't stop unless battery is disconnected. what is fix?


I would pull the fuse for the ABS hydraulic pump and then put it back in and see what happens. Don't ever recall a pump running. Dealer may need to hook up scan tool for diagnostic fault codes, DTCs.



Principles of Operation
The ABS control module receives wheel speed readings from both front wheel speed sensors and the rear differential speed sensor, and processes this information to determine if an ABS event is necessary. The wheel speed sensor electrically senses each tooth of the ABS sensor indicators as it passes through the wheel speed sensor's magnetic field.
The ABS control module continuously monitors and compares the rotational speed of each wheel speed sensor indicator and, when it detects an impending wheel lock, modulates brake pressure to the appropriate brake caliper(s). This is accomplished by triggering the hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected wheel returns to normal speed, the ABS control module returns the solenoid valves to their normal position, and normal (base) braking resumes.
The ABS control module is self-monitoring. When the ignition switch is turned to the RUN position, the ABS control module will do a preliminary electrical check, and at approximately 20 km/h (12 mph), the pump motor is turned on for approximately one-half second. Any malfunction of the ABS system will cause the ABS to shut off; normal power assisted braking, however, remains.
Inspection and Verification — Scan Tool Communications Check
  1. Verify the customer concern by carrying out the Drive Cycle Test.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Parking brake cable
  • Tire pressure
  • Tire size or mismatched tires
  • Blown fuse
  • Central junction box (CJB):
    • fuse 23 (10A)
  • Battery junction box
    • fuse 102 (50A)
  • Connectors or connections
  • Ground integrity
  • Harness routing
  • Wire chafing
  • Circuitry open/shorted

-----------------------------------------------------------------------
Anti-Lock Control The four-wheel anti-lock brake system (4WABS) consists of the following components:
  • Anti-lock brake control module (2C265)
  • Front anti-lock brake sensor (2C204)
  • Front anti-lock brake sensor indicator (2C182)
  • Hydraulic control unit (2C219)
  • Rear anti-lock brake sensor (2C190)
  • Rear anti-lock brake sensor indicator (2C189)
  • Yellow ABS warning indicator

May 07, 2009 | 2000 Ford Expedition

1 Answer

Problem with my cruise control and ABS light on 03 Explorer


Anti-Lock Control —Vehicles Built After 03/2002 The 3-channel anti-lock brake system consists of the following components:
  • front wheel speed sensors
  • front wheel speed sensor rings
  • hydraulic control unit (HCU)
  • Anti-lock brake control module (ECU)
  • rear wheel speed sensor
  • rear wheel speed sensor rings
  • yellow anti-lock brake warning indicator
The 4-channel anti-lock brake system with traction control and stability assist system consists of the following components:
  • active brake booster with integral solenoid
  • brake booster release switch
  • front wheel speed sensors
  • front wheel speed sensor rings
  • hydraulic control unit (HCU)
  • stability assist module (ECU)
  • stability assist event indicator
  • lateral accelerometer
  • longitudinal accelerometer (4x4)
  • rear wheel speed sensors
  • rear wheel speed sensor rings
  • steering wheel position sensor
  • yaw rate sensor
  • yellow anti-lock brake warning indicator
  • brake pressure transducer
  • traction control switch
---------------------------------------------------------------------
I suspect the abs issue is causing the speed control not to work if it happened at the same time the cruise control stopped working. When the yellow ABS light comes on, it means the ABS is dactivated. You may have a faulty accelerometer which senses acceleration and yaw (side to side lean). I have not seen a bad one but you said it is sensitive to acceleration.
I would unplug it and see what happens. The connector should have a small tab to depress so you can pull the connector out.
Here is where it is:

Accelerometer Removal and Installation
  1. NOTE: The accelerometer is located under the center, rear passenger seat carpet. (I think you have to remove seat for access).
    Cut the carpeting along the perforations.
  1. Disconnect the electrical connector.
  1. Remove the nuts and remove the accelerometer.
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Have dealer hook up tester and pull fault codes if you can't find an easy solution.
Some background info
  • A malfunction in the anti-lock brake system will cause the anti-lock brake control module to shut off or inhibit the system. However, normal power-assisted braking remains.
  • Malfunctions are indicated by the yellow ABS warning indicator in the instrument cluster.
  • The anti-lock brake system is self-monitoring. When the ignition switch is turned to the RUN position, the anti-lock brake control module will carry out a preliminary self-check on the anti-lock electrical system indicated by a three-second illumination of the yellow ABS warning indicator in the instrument cluster.
  • During vehicle operation, including normal and anti-lock braking, the anti-lock brake control module monitors all electrical anti-lock functions and some hydraulic operations.
  • Each time the vehicle is driven, as soon as vehicle speed reaches approximately 20 km/h (12mph), the anti-lock brake control module turns on the pump motor for approximately one-half second. At this time, a mechanical noise may be heard. This is a normal function of the self-check by the anti-lock brake control module.
  • Pedal pulsation coupled with noise while braking on loose gravel, bumps, wet or snowy roads is normal and indicates correct functioning of the anti-lock brake system.
  • Warning Lamp Indicator
    The anti-lock brake system (ABS) uses the yellow ABS warning indicator to alert the driver of a malfunctions in the ABS.
    The yellow ABS warning indicator will come on to warn the driver that the ABS has been turned off due to a symptom that exists in the ABS. Normal power assist braking remains but wheels can lock during a panic stop while the yellow ABS warning indicator is illuminated.

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    Please report back, I am curious if that is what it is. Good luck

    Mar 03, 2009 | 2003 Ford Explorer

    2 Answers

    Anti lock brake light


    abs relay some times go bad

    Dec 05, 2008 | 1999 Oldsmobile Alero

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