Lost Its Sparkle: SureTrack Real Fix

June 7, 2022 by Nick Taylor

Real Fixes from Mitchell 1’s SureTrack® expert information resource are documented issues from actual shop repair orders 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.

Vehicle
2013 Chevrolet Spark LS 1.2L

Title
P2135, Replaced Throttle Body Wiring Harness

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 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.

Correction
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.

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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.