Re: Tac and speed odomitor just stoped working on my 1997...
Clusters are sent out to repair facilities for exchange. They are built by Nippendenso and rebuilt at an authorized factory center. You can have this done by taking it to any Chevy Parts department for service
The reason is the circuit boards go bad in these, GM doesn't sell the parts to the public, only factory approved repair centers can buy the part.The reason is the circuit boards go bad in these, GM doesn't sell the parts to the public, only factory approved repair centers can buy the part.
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Any code's stored in the cruise control ?
DTC P0567 (4.8L, 5.3L, 6.0L, and 8.1L)
DTC P0567 (6.6L)
DTC P0568 (4.8L, 5.3L, 6.0L, and 8.1L)
DTC P0568 (6.6L)
DTC P0571 (4.8L, 5.3L, 6.0L, and 8.1L)
DTC P0571 (6.6L)
DTC P1574
The cruise control Resume/Accel switch is an input to the throttle actuator control (TAC) module. The TAC module uses the cruise control resume/accel switch signal circuit in order to detect when the driver has requested to accelerate the set vehicle speed or to resume the cruise control system. The TAC module detects a voltage signal on the cruise control resume/accel switch signal circuit when the switch is applied. The TAC module sends a serial data signal to the powertrain control module (PCM) via the UART serial data circuit. This DTC sets if the PCM receives a serial data signal from the TAC module indicating that voltage is present on the cruise control resume/accel switch signal circuit for longer than 90 seconds.
Does the vehicle have Throttle Actuator Control - electronic throttle control ?
This is very complex , first thing is have the vehicle checked for DTC'S - diagnostic trouble codes stored in the BCM , PCM !
The body control module (BCM) monitors the signal circuit of the cruise control switches. The BCM relays the cruise control switch status to the engine control module (ECM) via the GMLAN serial data circuit. The ECM uses the status of the cruise control switch to determine when to capture and maintain the vehicle speed. The ECM monitors the vehicle speed signal circuit in order to determine the desired vehicle speed. The ECM uses the throttle actuator control (TAC) motor in order to maintain the vehicle speed. For further information on the TAC System, refer to Throttle Actuator Control (TAC) System Descriptionfor the 4.3L engine or Throttle Actuator Control (TAC) System Description for the 4.8L, 5.3L, 6.0L, 6.2L or 7.0L engines.
Your best bet would be to take to the dealer !
Yo
You might be looking at a bad Crankshaft position sensor and/or Vehicle Speed Sensor. If they went out at the same time though, I would suspect a wiring issue. Also GM/Chevy guages are notorious for failing. There could be quite a few things that would cause this. Try searching Yelp for a shop in your area that specializes in automotive electronics. If you prefer to tackle it yourself though, these sensors are both common failure items so it wouldn't be a bad idea to replace them and see if that solves the issue.
SOUNDS LIKE THE SWITCH & OR THE BLOWER MOTOR RESISTOR, ARE THE PROBLEM WITH THE LOWER SPEEDS. SPEED 5 MAY HAVE ITS OWN FUSE, REFER TO OWNERS MANUAL FOR INFORMATION ABOUT THE HEATER/AC FUSE.
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