Hi there. We have an ‘09 GMC Acadia. 131K miles on it. Back story: Earlier this year when we were in the mountains the check engine light came on. Code read fuel pump control module, low voltage. It was a rainy wet cold day. The next day we cleared the code, and it has only come back on days it sta…

Neither code points to a problem with the throttle body. Both both codes point to a problem with the accelerator pedal position sensor. [image] Tester

“OBD II fault code is defined as “Throttle/Pedal Position Sensor/Switch B Range/Performance”, and set when the PCM (Powertrain Control Module) detects a signal voltage from the TPS (Throttle Position Sensor) that does not correlate with the current engine speed.”

Everywhere I look that code description mentions the Throttle Position Sensor, not the pedal position sensor

Accelerator pedal/throttle pedal. Six of one, half dozen of the other. Tester

Isn’t there a sensor on the throttle body called the “Throttle Position Sensor?”

No. Your vehicle has an electronic throttle body. [image] The throttle pedal position sensor sends a signal to the computer, and the computer operates the electronic throttle body. Tester

The throttle is the part on the engine that opens up to let air in. The accelerator is the pedal you push when you want to go faster. Both of these parts are electronic and each has sensors built into them. The accelerator and the throttle should both match closely when the system is working properl…

Just a thought: would it be possible that there is a wiring or connector issue? I’m thinking this because symptoms occured during wet conditions. The connector at the ECM might be bad or reference voltage might be off. I don’t know this cars layout but they might be related.

Does the vehicle have a sunroof? [image] Rain, rain, go away! Maintenance/Repairs The other day, my wife told me there was something wrong with her car (2012 Chevy Malibu). The “Check Engine” light was on, the odometer area was reading"engine power reduced", “service ESC” …

‘09 Acadia Losing Power, Stabilitrak, Service Light

Maintenance/Repairs

NYBo December 27, 2020, 4:23pm 11

Does the vehicle have a sunroof?

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‘09 Acadia Losing Power, Stabilitrak, Service Light

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