Electronic throttle controls have become ubiquitous on new vehicles. The days of the simple throttle cable are going away. Follow this Real Fix to see how a Chevrolet Cruze with an erratic throttle and a code P2135 was diagnosed and the problem that was found and corrected.
Vehicle
2015 Chevrolet Cruze LT 1.4L
Title
P2135, Replaced Electronic Throttle Control Motor Connector
Complaint
The customer states the check engine light is on.
Cause
Connected a scan tool and found code P2135 – Throttle Position (TP) Sensor 1-2 Correlation. Performed a road test with the scan tool connected and found the signal parameter from the electronic throttle control was erratic and had dropouts. Performed a visual inspection of the electronic throttle control motor connector, terminals and wiring harness and found with the engine idling, wiggled the wiring harness at the electronic throttle control motor and the engine idle became erratic. Disconnected the connector from the electronic throttle control motor for inspection and found the connector was damaged and the terminals no longer locked into place. Performed a drag test on the electronic throttle control motor connector terminals and found the terminals failed the drag test. These test results verified the electronic throttle control motor connector was faulty.
Correction
Replaced the electronic throttle control motor connector, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.
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