Gas pedal will not do anything, codes U0107, P0700, P1780, P0455

DAVID FOCUSEDONME COLLINS

MEMBER
2005 CHEVROLET EQUINOX
6 CYL
4WD
AUTOMATIC
129,000 MILES

I was driving one day and my pedal stop working, it does nothing. I replaced the throttle body completely and that didn't work. So I replaced the vapor canister purge valve still nothing. My car the whole time is in low power mode. I got the car scanned before I changed anything I got the codes u0107, p0700, p1780, p0455. Please help me I need my car. I'm disabled that's the only way I can get around.

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon,

The 1780 is the key. That is a code for the PCM internal processor error. That would also cause all the other codes as well.

You need to replace the PCM, have it flashed to your vin and the retest for any codes after driving it.

Roy

P1780
Descriptor
Af33-5
Probable Causes
Powertrain Control Module (PCM)

1. Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.

IMPORTANT:
- It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.
- It is necessary to record the remaining automatic transmission fluid life. If the replacement module is not programed with the remaining automatic transmission fluid life, the automatic transmission fluid life will default to 100%. If the replacement module is not programmed with the remaining automatic transmission fluid life, the automatic transmission fluid will need to be changed at 83000 km (50,000 mi) from the last automatic transmission fluid change.

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2. Remove the powertrain control module (PCM) (1) and PCM bracket (2) from the battery box cover.

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3. Remove the PCM bracket (2) from the PCM (1).
4. Disconnect the PCM wire harness (4) from the battery box cover.
5. Disconnect the negative battery cable.
6. Remove the PCM connectors (2) from the PCM (3).
7. Remove the PCM (3) from the vehicle.

INSTALLATION PROCEDURE

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1. Install the PCM (3) to the vehicle.
2. Install the PCM connectors (2) to the PCM (3).
3. Connect the negative battery cable.

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4. Connect the PCM wire harness (4) to the battery box cover.

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5. Install the PCM bracket (2) to the PCM (1).
6. Install the PCM bracket (1) to the battery box cover.
7. Reprogram the PCM. See: Vehicle > Programming and Relearning

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