Transmission Problems on my 2005 Buick Rendezvous
Mileage = 46,000
Engine size = 3.6Lt
dash lights = AWD
GM Computer codes = P0729,P0723
Repair work done prior = Checked all connections to sensors in wheels and transmission. Fluid has been
changed as recently as 5k prior to problem
Work done to repair this problem = No repairs just troubleshooting, had codes cleared problem
re-appeared
tip/donation yes
GM tech = SF
question = 2005 AWD Buick Rendezvous 3.6Lt, Speedometer erratic, lurching acceleration and shifting at
moderate speeds around 35 to 50 MPH, AWD illuminates and goes off unable to set cruise control
odometer reads error. Had codes cleared problem re-appeared, checked wiring to PCM ohm checked
wiring harnesses from wheel bearings and from sensor in transmission all OK.
Can the sensor in the trans be accessed by the pan? Is this a common problem with the Buick
transmission? Should I first replace the harness to the PCM? Last question if it has to be fixed in the
transmission can a DIY selfer pull the trans, I'm a very good mechanic.
SF:
My charts are not showing a P0729 for a 2005 AWD.
No, this not a common problem. Have not really had this too often.
Was wondering why you say checked harness from sensor to PCM. My chart shows vehicle speed sensor
wiring goes straight to Trans control Module (TCM).
Sensor is on tail / extension housing of trans. Yellow and Purple wires.
Visitor:
Sorry 0729 is one of the codes that reads output speed sensor low voltage, and your right again it's the
TCM module located adjacent the air filter box. What about the sensors in the transmission itself, can they
be accessed by the pan?
SF:
The vehicle speed sensor and output speed sensor are on and the same. See pic attached.
Look very closely at the wires at the sensor connector. Pull on each wire to see is the colored insulation
stretches. If it does, then the copper is broken inside the insulation.
Also, you can remove the sensor, use a mirror to get a small screwdriver on the reluctor wheel in the trans.
See if the reluctor moves / spins. If it does, then the wheel is broken.
Other that, i would say just a sensor problem. This would obviously affect speedometer, cruise, dash
cluster.
Visitor:
Ok fabulous, So the sensor depicted in the picture is removable as shown. If the relucter wheel isn't
broken and the wiring is good the sensor can be replaced without removing the transmission. Your advice
is terrific.
SF:
Yep, you got it.
This is your most likely cause.
Mileage = 46,000
Engine size = 3.6Lt
dash lights = AWD
GM Computer codes = P0729,P0723
Repair work done prior = Checked all connections to sensors in wheels and transmission. Fluid has been
changed as recently as 5k prior to problem
Work done to repair this problem = No repairs just troubleshooting, had codes cleared problem
re-appeared
tip/donation yes
GM tech = SF
question = 2005 AWD Buick Rendezvous 3.6Lt, Speedometer erratic, lurching acceleration and shifting at
moderate speeds around 35 to 50 MPH, AWD illuminates and goes off unable to set cruise control
odometer reads error. Had codes cleared problem re-appeared, checked wiring to PCM ohm checked
wiring harnesses from wheel bearings and from sensor in transmission all OK.
Can the sensor in the trans be accessed by the pan? Is this a common problem with the Buick
transmission? Should I first replace the harness to the PCM? Last question if it has to be fixed in the
transmission can a DIY selfer pull the trans, I'm a very good mechanic.
SF:
My charts are not showing a P0729 for a 2005 AWD.
No, this not a common problem. Have not really had this too often.
Was wondering why you say checked harness from sensor to PCM. My chart shows vehicle speed sensor
wiring goes straight to Trans control Module (TCM).
Sensor is on tail / extension housing of trans. Yellow and Purple wires.
Visitor:
Sorry 0729 is one of the codes that reads output speed sensor low voltage, and your right again it's the
TCM module located adjacent the air filter box. What about the sensors in the transmission itself, can they
be accessed by the pan?
SF:
The vehicle speed sensor and output speed sensor are on and the same. See pic attached.
Look very closely at the wires at the sensor connector. Pull on each wire to see is the colored insulation
stretches. If it does, then the copper is broken inside the insulation.
Also, you can remove the sensor, use a mirror to get a small screwdriver on the reluctor wheel in the trans.
See if the reluctor moves / spins. If it does, then the wheel is broken.
Other that, i would say just a sensor problem. This would obviously affect speedometer, cruise, dash
cluster.
Visitor:
Ok fabulous, So the sensor depicted in the picture is removable as shown. If the relucter wheel isn't
broken and the wiring is good the sensor can be replaced without removing the transmission. Your advice
is terrific.
SF:
Yep, you got it.
This is your most likely cause.
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Buick Rendezvous 2003
Just purchased it -- used
Question = the traction light keeps coming on and the brakes feel like their come up through the floor. It's getting worse.
Is this unsafe and who can I go to get it fixed? I need an answer asap as I'm going out of town tomorrow. thanks.
Just purchased it -- used
Question = the traction light keeps coming on and the brakes feel like their come up through the floor. It's getting worse.
Is this unsafe and who can I go to get it fixed? I need an answer asap as I'm going out of town tomorrow. thanks.
Answer: You've most likely got a bad wheel speed sensor, that is part
of the anti lock brake system. When these go bad, the symptoms are
usually the traction light or ABS light coming on, and an odd feeling
in the brake pedal as you come to a stop. You would need to get the
vehicle scanned to see which wheel speed sensor is acting up, as it
would have set a code. The sensors are part of the hub bearing
assemblies for each wheel. Which ever one is acting up, you'll need
that particular hub replaced. That should solve your problem.
of the anti lock brake system. When these go bad, the symptoms are
usually the traction light or ABS light coming on, and an odd feeling
in the brake pedal as you come to a stop. You would need to get the
vehicle scanned to see which wheel speed sensor is acting up, as it
would have set a code. The sensors are part of the hub bearing
assemblies for each wheel. Which ever one is acting up, you'll need
that particular hub replaced. That should solve your problem.
