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Diagnostic codes u1040 - 2001 Oldsmobile Alero

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What does code PU401, PU463,P1189, and U1040 mean???

U, B, C and P codes above P0800 are considered enhanced manufacturer specific codes. So without knowing the year, make, model and engine, nobody can answer your question.

Jun 27, 2017 | Cars & Trucks

1 Answer

I have a 2003 bonniville sle i have a code U1040. Where is the EMCM AND PCM LOCATED

DTC U1001-U1254 IPC, PCM, SDM

Electronic Brake Control Module (EBCM)

The control module ID number list below provides a method for determining which module is not communicating. A module with a class 2 serial data circuit malfunction or which loses power during the current ignition cycle will have a Loss of Communication DTC set by other modules that depend on information from that failed module. The modules that can communicate will set a DTC indicating the module that cannot communicate. When no message is detected from a learned identification number for 5 seconds, a DTC U1??? where ??? is equal to the 3-digit identification number is set.
Control Module
ID Number
Powertrain Control Module (PCM)
Electronic Brake Control Module (EBCM)
Dash Integration Module (DIM)
HVAC Control Module or IPM
Rear Integration Module (RIM)
Inflatable Restraint Sensing and Diagnostic Module (SDM)
Instrument Panel Cluster (IPC)
Head Up Display (HUD)
Remote Playback Device - CD Changer
Digital Radio Receiver (DRR)
Vehicle Communication Interface Module (VCIM)
Driver Door Module (DDM)
Front Passenger Door Module (FPDM)
Left Rear Door Module (LRDM)
Right Rear Door Module (RRDM)
Memory seat Module (MSM)
Driver Door Switch Assembly (DDSA)
Remote Control Door Lock Receiver (RCDLR)
Theft Deterrent Control Module
The electronic brake control module is communicating , no need to bother the PCM . The code was set in pcm because it lost communication with EBCM , PCM not the problem .
Electronic Brake Control Module (EBCM)
Left Front lower corner of the engine compartment, under the air cleaner housing .
Check power's an ground's . Will a scan tool talk to it ?

Oct 03, 2016 | Cars & Trucks

1 Answer

What is trouble code U1040

Loss of Class 2 Communications with ABS

Dec 13, 2013 | 2002 Buick LeSabre

1 Answer

Im getting a U1040 code- (loss of communication with brake control module

Loss of communication with brake control module is exactly what it says. There is a problem with the wiring harness that goes to the ABS controller. You might make sure it is plugged all of the way in. You might also unplug it and make sure there is no corrosion or damages pins in the connector.

Apr 22, 2013 | Chevrolet Cars & Trucks

1 Answer

What is the most common cause of service code U1040 in a 2002 Pontiac Grande AM GT?

DTC U1040 indicates that the ABS module is not capable
of sending its state of health message. ( and this makes the ABS Light not flash ) check connections on the Module ...all fuses ...

Possable causes :
Open ABS fuse
Open battery circuit
Open ground circuit
Open serial data circuit
Short to ground in power circuit
ECU malfunction

I found a code chart at another web site.U1040 indicates no serial data communication with ABS module.I checked for wake up signal,it was there.I checked ground connection,it was good.I checked for B+ at module with DVOM and had battery voltage at both pins.I then load tested both B+ terminals and found the circuit was faulty.I went to the 30 amp ABS fuse and did a voltage drop test .I found the female connectors that the fuse plugged in to did not make good connection with the fuse.I bent the fuse pins outward and reinstalled.The ABS module came back on line.This bike has less than 2500 miles on it and this connection is already faulty.Is there a way to look up TSB'S for harley?.Bending the fuse pins is only a temperary fix.If there is no TSB for this problem I'm going to wire in a ATO fuse instead of the mini that Harley uses.The ABS motor draw on every start up appears to be excessive for that mini fuse connector.

Dec 23, 2012 | Cars & Trucks

1 Answer

What does code u1040 mean????

what does u1040, c1298, and c1248 mean for my car?

Oct 16, 2012 | 2002 Pontiac Bonneville

1 Answer

Code u1040 03 pontiac gp

Hi, if you are receiving a u1040 code ,the car needs to be put on a good scanner to see which module is not communicating this includes the pcm-ebcm-bcm-sir/sdm-ipc-radio and the pass key 111, you need to check the battery hots, ignition hots ,grounds and serial data lines to each module if the scanner cannot communicate with any of the modules, the serial data line will have a very low amount of voltage and will be moving between low voltages check all the fuses and relays battery connections and grounds, the ignition relay is a good one to check, also for the antitheft reprogram relearn there is a 30 minute relearn process ;;try to start the vehicle and release the key do not turn it off wait ten minutes until the security light goes out then turn the key off for 5 seconds and turn the key back on wait 10 more minutes for the light to go off again turn the key off for 5 seconds and then back on for 10 minutes more after the light goes off turn the key off for 5 seconds and now try to start the car, if it still doesn’t start then check for any connections under the hood for water damage or critter damage.

Take care

Aug 06, 2010 | 2003 Pontiac Grand Prix

2 Answers

2001 cavalier codes

P0621 - indicates a failure in the alternator lamp curcuit.
P0304 - indicates a miss fire was detected in the #4 cylinder
U1040 - indicates a loss of communication with the ABS system
U1000 - Indicates a class 2 communication loss

None of those codes are relating to a transmission failure (P0700-P0702)

I would have a visual look at the transmission and verify that all electrical wires are connected and tight. Then I would have the transmission serviced if it hasn't been within the last 35,000 miles.

Have the trouble codes cleared and address the ones that return.

After that you may be looking at an internal transmission adjustment and/or repair.

Good luck.

Nov 24, 2008 | 2001 Chevrolet Cavalier

1 Answer

2006 lincoln town car

Did the dealer clear the codes last time you were in. they have to be cleared

Jul 28, 2008 | 2006 Lincoln Town Car

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