SureTrack Real Fix: Lost its Sparkle

Real Fixes from the SureTrack® expert information resource are documented issues from actual shop repair records and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is available at no additional cost in our ProDemand product.

Issues with the throttle position sensor on a vehicle are usually pretty easy to diagnose, but sometimes you have to dig deeper to find the issue. Follow this Real Fix to see how the problem with this Spark’s throttle control was diagnosed and repaired.

2013 Chevrolet Spark LS 1.2L

P2135, Replaced Throttle Body Wiring Harness

The customer states the check engine light is on.

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 throttle body was erratic and had dropouts. Performed a visual inspection of the throttle body electrical connector, terminals and wiring harness and found with the engine idling, wiggled the wiring harness at the throttle body electrical connector and the engine idle became erratic. Disconnected the connector from the throttle body for inspection and found the wiring harness was dry rotted. Opened the insulation and found the wires were corroded and the wires were exposed. These test results verified the throttle body wiring harness was faulty.

Replaced the throttle body wiring harness, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.

SureTrack® adds to the power of ProDemand® with an exclusive combination of real-world knowledge and powerful diagnostic tools, all wrapped in an interactive community of professional technicians. Designed to help automotive shops increase accuracy and efficiency from diagnosis to completed repair, the industry’s most comprehensive repair information resource is just a few clicks away.

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About the Author

Nick Taylor

Nick Taylor is the SureTrack Community Administrator and a Senior Applications Specialist at Mitchell 1 with over 25 years of experience with electronic repair data systems. Nick previously worked in the automotive dismantling and engine rebuilding industries.