Have a 1995 GMC 2500 Diesel 6.5...replaced speed sensor, front ABS on hubs lines and changed out the cluster with a used one and the speedometer still does not work??

car starts engine runs ok and drives ok and all gears work?>
check all fuses first
the scan the pCM for error ,for sure speed or comm errors
if the speed sensor fails so will transmission does it?
yes car is sold with manual transaxle, and are very different..
so this is automatic transmission.(guess1) A/T BOX.
NO junk $13 code reades, real scan tools see the Bnnnnn codes.
for VSS errors of any kind.or P07nn tranny codes and more.

no ABS errors or lamp, or ESP lamp glows?
no BCM errors, for sure driving and scanning or wheels up spin tires.(on stands:) safely.
the service manual covers all, read it yet?
car is not AWD is it?
many cars now use ABS to speed. (gee it's freed data why not ) ?
The PCM sends speed to the cluster.
the big problem here is assuming we know how this works.
and not reading the manual first.
the schematic show (on my screen now) the VSS1 on tranny is a 3pin hall sensor.
power 12v to sensor is fuSE B/UP in bay box.
speed out pin3 goes to vast things.

1. cluster pin a17 (obviously car must be moving to get output from pin3 above)
2. tire pressure contr
3. BCM
4. atm key control
5. DLC pin 6 can_bus high ( obd2,P6, WE CAN SCOPE VSS !
6. AC (hvac) controller

ALL 6 MODULES WILL DO DTC ERRORS FOR SPEED. IF FAILS.
EVEN STEERING CONTROLS TOO.

SEE DLC PIN6 ABOVE HOW EASY IT IS TO SEE VSS1?
A POWERFUL HALL OUTPUT SQUARE WAVE.
THE USA CAR USES A 16 PIN OBD2 DLC CONNECTOR
OUTSIDE USA THE DLC IS NOT 6 AT ALL.
IT IS 20 PINS 3ROWS OF PINS.

YOU DID NOT POST YOUR VIN# SO IT IS IMPOSSIBLE FOR ME TO KNOW WHAT CAR THIS IS. AND BUILT FOR WHAT COUNTRY EITHER. NOR IF A/T OR M/T BOX.
ABS LAMP IS NOT FAILING.
SORRY. ABOVE IS ALL PURE USA SERVICE MANUAL FACTS.
ONLY



I HAVE SCOPE AND CAN SEE PIN 6 ANY TIME i WANT AND EASY
OR GOOD OLD SKOOL, ANALOG VOLTMETER WITH NEEDLE
SCALE, AND SEE IT WAG HIGH LOW AS FRONT WHEELS SPIN.

MOSTLY NO VIN NO JOY HEAR SAD AND BIGTIME PAR.
THE TRANSMISSION NOT TOLD AT ALL .


COMMON DTC ERRORS VSS ( ROAD SPEED)
P0721 Output Speed Sensor Circuit Range/Performance
OR 722 OR 501
P2159? NOTE A P2 IS OEM FACTORY CODE !
A;/T BOX HAS 3 SPEED SENSORS, TURBON, MID AND TAIL
U0100 COMM ERRORS?

MOST MODERN CARS
WE SCAN IT DRIVING, AND LOG DATA
AND SEE IF THE PCM SEES SPEED ERRORS
AND SCAN ABS TOO, FOR SURE STICK SHIFT M/T BOX.
WITH PCM KNOWS CAR IS IN DRIVE, AND UP SHIFTING
AND VSS IS DEAD.
NEVER SEEN ANY CAR NOT SHOW THAT DATA IF VSS IS DEAD
REGARDLESS OF VSS SOURCE.
UNLESS TOY CODE READERS USED. (DON'T?)
GOOD LUCK TELL MORE GET MORE , THIS POST IS TOO LONG DUE NO VIN TOLD OR WHAT TRANSMISSION IS THERE.

The sensor is attached to the output shaft of the transmission and should not be affected by the work that you did. Are the ABS sensors ok?

You need to check the central unit processor that box controls every thing on the car and probably needs to be repaired or to be reset .
Thanks

NO code ? the first thing is to make sure all the fuse are good, the next thing is to connect a scan tool and check for readings to speed sensors.

Some of these use the wheel speed sensors to control the speedo and abs , the speed sensors in the transmission are used to control gear shifting, make sure the wheel sensors are working, the most common problems are the wiring to the rear sensor and the rear sensor itself, check on the rear end on the top and make sure connection is good and maybe replace that sensor and see what happens, i have run into this problem a few time but some were diffrent. one was a bad rear speed sensor another one was the cluster and the last was the abs module.

I would start with checking all the fuses first, then move on to replacing the rear speed sensor located on the rear top of the diffrential . good day.

Hi Timothy:
You will want to have it scanned for any trouble codes to see what area the problem may be in. Just let us know what the code(s) are and we can go from there.

The only thing that I can figure is that it may be that the ABS is activating at low speeds, as there is a bulletin that mentions that with no trouble codes. Wheel speed sensors, dirty.

Bulletin No.: 02-05-25-006B
Date: January 05, 2006
TECHNICAL
Subject: Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)

Models:
1999-2000 Cadillac Escalade
1995-1999 Chevrolet Silverado (Old Style)
1995-2000 Chevrolet Suburban, Tahoe (Old Style)
1995-2003 Chevrolet Astro Van, Blazer, S10
1995-1999 GMC Sierra (Old Style)
1995-2000 GMC Yukon, Yukon XL (Old Style)
1995-2001 GMC Envoy, Jimmy
1995-2003 GMC Safari Van, Sonoma
1995-2001 Oldsmobile Bravada

Supercede: This bulletin is being revised to update the correction and warranty information. Please discard Corporate Bulletin Number 02-05-25-006A (Section 05 - Brakes).

Condition: Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set.

Cause: The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface.

Correction:
Measure AC voltage and clean wheel speed sensor mounting surfaces.
1. Raise the vehicle on a hoist.
2. Disconnect both the front wheel speed sensor harness connectors.
3. Place a DVM across the terminals of each sensor connector.
4. Rotate the wheel with hand speed and measure the ACmV's. The reading should be at least 350 ACmV's.
5. If the reading is between 200 and 350 ACmV's, remove the wheel, caliper and rotor in order to gain access to the speed sensor.
6. Remove the wheel speed sensor and plug the hole to prevent debris from falling into the hub during service.
7. Clean the wheel speed sensor mounting surface using a wire brush, sand paper, emery cloth, ScotchBrite(TM) or other suitable material. Be sure to thoroughly clean the wheel speed sensor surface. There should be no rust or corrosion.
8. Check the sensor head to determine if it has been warped/distorted due to the corrosion build up or other causes. Check the mounting surface on the sensor head for flatness by placing it on the edge of a metal machinists scale or other suitable straight edge to measure the flatness. Check the sensor for flatness in multiple (minimum 3) positions/directions. If the sensor head is distorted, replace the sensor.
9. Apply (spray) two thin coats of the specified rust penetrating lubricant (corrosion inhibitor) to the complete sensor mounting surface on the bearing hub. Allow to dry for 3-5 minutes between coats. Use ONLY Rust Penetrating Lubricant, P/N 89022217 (Canadian P/N 89022218).
10. When the corrosion inhibitor is dry to the touch (about 10 minutes), apply a thin layer of bearing grease to the hub surface and sensor 0-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344 (Canadian P/N 993037).
11. Install either the original sensor or a new one in the hub and secure the sensor. Ensure that the sensor is seated flush against the hub.
12. Install the rotor, the caliper and the wheel.
13. Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel by hand. The voltage should now read at least 350 ACmV's.

Hope this helps; also keep in mind that your feedback is important and I will appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

The speed cluster work from the ABS speed sensors that have separate computer it is on engine compartment near battery and brake booster. This computer work independent and only get 12v and can bus send all the info by a can bus 2 wires that run to dodge ECM same wires run to cluster. I make a diesel swap speed work ok but not my RPM any ideas

Does the speedometer work? Out might have a bad speed sensor in the rear axle. Did you have it scanned for codes?

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Envoy instrument cluster repair

Here is a copy of a GM bulletin that applies to you concerns of low speed ABS activation.

Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #03-05-25-007 - (09/29/2003)
Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)

1999-2004 GMC Yukon XL

Condition:
Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set.

Cause
The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface.

Correction
Measure AC voltage and clean the wheel speed sensor mounting surfaces.

Raise and support the vehicle.
Disconnect both the front wheel speed sensor (WSS) connectors at the frame and harness.
Place a Digital Volt Meter (DVM) across the terminals of each WSS connector.
Rotate the wheel clockwise approximately one revolution per second. The minimum reading should be at least 350 ACmV's. If the reading is less than 350 ACmV's, remove the wheel speed sensor. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual. Plug the WSS bore in order to prevent debris from falling into the hub during service.
Clean the WSS mounting surface on the hub to remove any rust or corrosion using a wire brush, or equivalent.

Important
Make sure that the sensor sits flat on the hub. Check the sensor flange against a straight edge to ensure flatness. If the sensor flange is distorted, replace the sensor.

Apply a thin layer of bearing grease to the hub surface and sensor O-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344.
Install either the original sensor or a new one in the hub. Ensure that the sensor is seated flush against the hub. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual.
Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel. The voltage should now read at least 350 ACmV's.

Good luck and thank you for using Fixya.

The abs light has to be reset by a scan tool.It should not have come on unless the new wheel speed sensor is faulty or you forgot to plug it back in or you turned the key on while the sensor was unpluged.Double check your work before having it reset.Good Luck!!!!!