Here's a great clue...Sticky vac sensor
Quote:
Originally Posted by mbar
Update:
Car just came back from the dealer. Scan tool found 1 time code
C025E - brake booster vacuum sensor.
They drove the car around and code did not reproduce the code. They said it was a one time code and it's all good...
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Power Brake Booster Replacement
The vacuum in the brake booster assembly is measured by the brake booster vacuum sensor.
The Engine Control Module (ECM) supplies a 5 V reference and a low reference circuit to the brake booster vacuum sensor.
The vacuum sensor supplies a voltage signal in relation to the pressure in the brake booster to the ECM.
To address this condition, install a new power vacuum brake booster.
Do not replace the ECM or power brake booster vacuum sensor.
YMMV