ABS/Traction Control and ABS codes C1232, 1233, 1234 and 1248

Tiny
FGR8FRK
  • MEMBER
  • 2002 CHEVROLET MONTE CARLO
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 236,000 MILES
Message Center says "Service Traction Control", lights on constant are Trac Off, red brake light, and ABS. Surely it would not have 3 bad wheel sensors. Also, brake fluid level is full.
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Friday, May 8th, 2020 AT 10:47 AM

13 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

Do you have a scan tool to read live data from the sensors while driving? That will tell you which wheel or wheels are not sending any signals.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

https://www.2carpros.com/articles/how-to-replace-an-abs-wheel-speed-sensor

Roy

Circuit Description
As the wheel spins, the wheel speed sensor produces an AC signal. The EBCM uses the frequency of the AC signal to calculate the wheel speed.

Conditions for Running the DTC
C1221 through C1228
DTCs C1232 through C1235 are not set.
The brake pedal is not pressed.
The ABS is not active.

C1232 through C1235
The ignition is ON.

Conditions for Setting the DTC
C1221 through C1224
All of the following conditions exists for 2.5 seconds:
The suspect wheel speed equals zero.
The other wheel speeds are greater than 8 km/h (5 mph).
The other wheel speeds are within 11 km/h (7 mph) of each other.

C1225 through C1228
The EBCM detects a rapid variation in the wheel speed. The wheel speed changes by 24 km/h (14.9 mph) or more in 0.01 second. The change must occur 5 times with no more than 1 second between occurrences.

C1232 through C1235
One of the following conditions exists for 0.02 seconds:
A short to voltage - the wheel speed sensor signal circuit and wheel speed sensor return circuit voltages are both greater than 4.25 volts.
A short to ground - the wheel speed sensor signal circuit and wheel speed sensor return circuit voltages are both less than 0.75 volts.
An open - the wheel speed sensor signal circuit voltage is greater than 4.25 volts and wheel speed sensor return circuit voltage is less than 0.75 volts.

Action Taken When the DTC Sets
If equipped, the following actions occur:
The EBCM disables the ABS/TCS for the duration of the ignition cycle.
The EBCM temporarily suspends the TIM monitoring function while the DTC is set.
The DRP does not function optimally.
The ABS indicator turns ON.
The Traction Off indicator turns ON.
The message center displays the Service Traction System message.

Conditions for Clearing the DTC
The condition for the DTC is no longer present and you used the scan tool Clear DTC function.
The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
C1221 through C1224
Under the following conditions, 2 Wheel Speed Sensor Input is 0 DTCs are set:
The 2 suspect wheel speeds equal zero for 20 seconds.
The other wheel speeds are greater than 16 km/h (10 mph).
The other wheel speeds are within 11 km/h (7 mph) of each other.
Diagnose each wheel speed sensor individually.

C1225 through C1228
A possible cause of this DTC is electrical noise on the wheel speed sensor harness wiring. Electrical noise could result from the wheel speed sensor wires being routed to close to high energy ignition system components, such as spark plug wires.

C1232 through C1235
If the customer comments that the ABS indicator is ON only during moist environmental conditions: rain, snow, vehicle wash, etc., inspect the wheel speed sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure:
1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons of salt to 8 fl. oz. of water (10 g of salt to 200 ml. of water).
2. Test drive the vehicle over various road surfaces: bumps, turns, etc., above 40 km/h (25 mph) for at least 30 seconds.
3. If the DTC returns, replace the suspected wheel speed sensor or repair the wheel speed sensor wiring.
4. Rinse the area thoroughly when completed.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. Measures the resistance of the wheel speed sensor in order to determine if the sensor has a valid resistance value.
5. Ensures that the wheel speed sensor is generating a valid AC voltage output.
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Friday, May 8th, 2020 AT 11:42 AM
Tiny
FGR8FRK
  • MEMBER
Unfortunately the one I have only reads the codes and erases.
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Saturday, May 9th, 2020 AT 1:47 AM
Tiny
ASEMASTER6371
  • EXPERT
You will need a scan tool that can read the live data. See if you can borrow one or maybe have a shop just diagnose the issue for you and you can do the repair.

Roy
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Saturday, May 9th, 2020 AT 1:55 AM
Tiny
FGR8FRK
  • MEMBER
Roy,

I found and fixed a couple of broken wires and that fixed my issue with all the trac/ABS/brake lights.
Maybe you have some insight on this:
Now I have to figure out the "Service Vehicle Soon" message.
I borrowed a friends Solus Pro since my Innova 3100j won't read body codes.
It brings up a "B2647 Ambient Light Sensor Circuit Low".
I went to the friends junkyard and pulled 3 sensors and none of them will fix the issue. I can buy a new sensor but surely all 3 of these aren't bad also?
I attached the data view, it started at 0.2 and went as high as 0.5 on my drive home.
Any help would be appreciated.

Pete
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Wednesday, May 13th, 2020 AT 9:07 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay, I attached the circuit description and flow chart below. This looks like a wiring issue with the wires to the sensor.

The sensor should have 5 volts like any other sensor in the car. I attached a diagram for you of the sensor which shows the pin number at the BCM that sends the 5 volt signal.

Roy

CIRCUIT DESCRIPTION
The body control module (BCM) uses the DRL ambient light sensor to control the automatic headlamp system. The DRL ambient light sensor is connected directly to the BCM through the DRL ambient light sensor signal circuit and the DRL ambient light sensor low reference circuit.

CONDITIONS FOR RUNNING THE DTC
The DRL feature or the automatic headlamp control feature must be enabled.

CONDITIONS FOR SETTING THE DTC
The BCM detects a short to ground in the DRL ambient light sensor signal circuit.
The condition above must be present for more than 0.3 seconds.

ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B2647 in memory.
The SERVICE VEHICLE SOON telltale illuminates
The headlamps, park lamps, tail lamps and marker lamps will illuminate to night intensity.

CONDITIONS FOR CLEARING THE DTC
The BCM no longer detects a short to ground in the DRL ambient light sensor signal circuit.
A history DTC B2647 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

DIAGNOSTIC AIDS
If the DTC B2647 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.
The following conditions may cause an intermittent malfunction to occur:
An intermittent short to ground in the DRL ambient light sensor signal circuit.
The DRL ambient light sensor is intermittently shorted to ground internally.
The BCM is intermittently shorted to ground internally.
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Thursday, May 14th, 2020 AT 3:37 AM
Tiny
FGR8FRK
  • MEMBER
Roy, I appreciate the help. I probed the wires at the plug and get the same reading so I think the wire is good to the sensor. When I did the step where I unplugged the sensor, I attached that reading. I'm getting to the extent of my abilities but it's looking like maybe it's the BCM. Pete
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Thursday, May 14th, 2020 AT 12:27 PM
Tiny
ASEMASTER6371
  • EXPERT
The fact you have low voltage to the sensor tells me either the wiring or the BCM.

What was the voltage at B5 at the body control module?

Roy
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Thursday, May 14th, 2020 AT 12:48 PM
Tiny
FGR8FRK
  • MEMBER
.4 light green/black. I was supposed to leave it plugged in correct?
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Thursday, May 14th, 2020 AT 12:50 PM
Tiny
ASEMASTER6371
  • EXPERT
Correct. If there is not 5 volts at that plug or terminal, the BCM is the issue.

Roy
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Thursday, May 14th, 2020 AT 1:15 PM
Tiny
FGR8FRK
  • MEMBER
Okay, thanks. Please 1 more question. Removed the BCM and it's not marked with a part number other than on the side it has a sticker that has a number "13233032013270 remfg" so it's been replaced before I'm guessing. So GM Parts Direct list 19244861 as a direct replacement. I've seen some on ebay and I have access to my buddies junkyard which he has a couple of these MC's and some Impalas, from what I'm seeing they are compatible with a different part number. Will this be plug and play or will it have to be programmed, and will I be able to do it myself? Again I really appreciate your help.

Pete
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Thursday, May 14th, 2020 AT 2:21 PM
Tiny
ASEMASTER6371
  • EXPERT
They need to be programmed and I will warn you that a used BCM has about a 10% chance of taking the programming. The dealer will not even consider doing it.

The part number must be exactly the same.

Roy
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Thursday, May 14th, 2020 AT 3:04 PM
Tiny
FGR8FRK
  • MEMBER
Roy,

Good afternoon, so I bought a BCM off eBay through a service that takes your VIN info and the part number which I got off of GM Parts Direct website, and they program/flash them for that specific vehicle. Received it today and plug it in, it fixes the "Service Vehicle Soon" and the DRL voltage shows 4.5, and no codes, but now it won't start and the security light flashes 3 times. It came with instructions on relearning, "turn key on for 10 minutes, when it stops flashing, turn off for 5 seconds and repeat 3 times", and then try to start. Nothing. It talks about pass lock III and a chip in the key but from what I've read there are no chips in these keys. Plug my old BCM in and it starts right up but has the previous problems. Any input would be appreciated.

Pete Harlow
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Friday, May 22nd, 2020 AT 6:14 PM
Tiny
ASEMASTER6371
  • EXPERT
Try the process again but do not wait for the 5 seconds.

At the end of the third time, it should have learned the password.

If it does not get another BCM.

Roy
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Saturday, May 23rd, 2020 AT 3:53 AM

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