My 2007 GMC Yukon started throwing a throttle body sensor error code. It then started having mistimed shifts. I replaced the sensor. It did not improve. I took it to a shop, they replaced the sensor again and cleaned the throttle body. I got the car back and it wasn't much better, and would not shift from 3-4. I took it back to the shop. They checked the throttle body again and cleared throttle codes. They then proceeded to tell me I needed a new transmission. The car came back to us in limp mode, It was not in limp mode when we took it in. I am skeptical that this is a transmission issue. Has anyone had similar problems?
2007 Yukon, Throttle Problem or Transmission problem
- Thread starter tcb073
- Start date
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iamdub
Full Access Member
What was the "throttle body sensor" code?
What sensor was replaced?
Is this a 4- or 6-speed?
2WD or 4WD?
Denali with AWD?
What sensor was replaced?
Is this a 4- or 6-speed?
2WD or 4WD?
Denali with AWD?
Did either you or the shop perform the throttle body relearn procedure after the position sensor was replaced?
May have a problem with the sensor on the throttle pedal assembly under the dash. I recently had no problems, but as stated in my build thread, I did a new throttle body, all related sensors and rewiring and the throttle pedal assembly with the new sensor. My recent 5500+ mile round trip was flawless.
swathdiver
Full Access Member
From the shop manual:
Circuit/System Testing
1. Inspect for the following conditions:
Vacuum hoses for splits, kinks, and proper connections as shown on Vehicle Emission Control Information label
Inspect thoroughly for any type of leak or restriction
Air leaks at throttle body mounting area and intake manifold sealing surfaces
Throttle body for dirt, debris, and coking—Refer to Throttle Body Cleaning.
2. Allow the engine to reach operating temperature. Observe the MAP Sensor Voltage parameter with a scan tool. Voltage should be more than 0.8 volt and less than 4 volts.
If more than 4 volts or less than 0.8 volt, refer to DTC P0106.
3. Idle the engine. Observe the MAP Sensor kPa parameter with a scan tool. Increase the engine speed slowly and then back to idle. The MAP sensor kPa should change smoothly and gradually as engine speed is increased and returned to idle.
If the MAP sensor kPa does not change, refer to DTC P0106.
4. Take a snapshot of the engine data list while performing the actions listed below. The mass air flow (MAF) sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.
Idle the engine.
Increase the engine speed slowly to 3,000 RPM, then back to idle.
Exit from the snapshot and review the data.
Observe the Mass Air Flow (MAF) Sensor parameter frame by frame with a scan tool. The MAF sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle .
If the MAF sensor g/s does not change smoothly and gradually as the engine speed is increased and is returned to idle, refer to DTC P0101 or P1101.
5. Inspect the throttle body for the following conditions:
Loose or damaged throttle blade
Broken throttle shaft
Any throttle body damage
If any of these conditions exist, replace the throttle body assembly.
