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2010 Jeep Grand Cherokee 3.7L 2WD: C1027, C102A, U1417 Codes - ABS, ESP, BAS Lights On | Troubleshooting Guide

Model: 2010 Jeep Grand Cherokee Fault Code: C1027 Posted: 2016-08-02 07:30

I own a 2010 Jeep Grand Cherokee 3.7L 2WD and recently encountered multiple OBD-II diagnostic codes: C1027, C102A, and U1417. These codes are triggering the ABS, ESP, and BAS warning lights on my vehicle. The specific fault codes indicate: - C1027: Left rear wheel speed sensor signal erratic performance - C102A: Left rear wheel speed comparative performance issue - U1417: Implausible left wheel distance signal received I have already replaced brake pads on all four wheels and recently changed the rims and tires. The left rear tire was not properly tightened during installation, which caused a noise. I suspect this may have contributed to the sensor issues. The ABS, ESP, and BAS warning lights appeared after the brake work. I did not reprogram the vehicle's system when installing new rims without TPMS sensors. The TPMS light is also currently on. I'm seeking advice on the most likely root cause and how to resolve these codes effectively.

Related fault codes
C1027U1417
Comments (7)
Anonymous 2016-08-02 07:44

C1027 indicates erratic signal from the left rear wheel speed sensor. C102A shows a performance discrepancy in comparing left rear wheel speed data. U1417 suggests an implausible distance signal is being received from the left wheel — all pointing strongly to issues with the left rear wheel speed sensor or its associated wiring and connectors.

Anonymous 2016-08-02 07:56

Thanks for the detailed breakdown, kev2. Could you please clarify what the most probable cause is based on these codes? I'm trying to prioritize repairs efficiently.

Anonymous 2016-08-02 09:30

Have you experienced a flat tire or used a spare wheel at any point? Are the original tires still installed? Are all four tires identical in size and type? Has there been any work done on the vehicle — such as removing wheels for maintenance? If so, inspecting the left and right rear wheel speed sensors, their wiring harnesses, and connectors is essential. Use an OBD-II scanner to check actual signal strength from both left and right rear wheel sensors.

Anonymous 2016-08-02 09:38

Thanks for the advice! I’ve confirmed that all tires have been replaced. The new rims do not include TPMS sensors. Only brake pads were installed on all wheels. The left rear tire was not tightened properly and made a noticeable noise — this may have caused mechanical stress to the wheel sensor or hub.

Anonymous 2016-08-02 12:59

It seems you're familiar with the diagnostic path — focusing on the left/rear wheel sensor makes sense. Did you reprogram the vehicle’s ABS, ESP, and speedometer systems after installing new wheels without TPMS? This is critical when changing rims or tires that lack TPMS functionality. Also, what was the reason for removing TPMS sensors? How can I keep these warning lights off safely?

Anonymous 2016-08-02 13:30

No, I did not reprogram the system after installing new rims without TPMS sensors. A friend installed the rims — they don’t have TPMS. The TPMS warning light is also on, and I apologize for missing this detail earlier.

Anonymous 2016-08-03 18:39

Hey kev2! Great to hear from you. Good news: Since all codes pointed to the left rear wheel, I replaced just that speed sensor. After clearing the ABS, ESP, and BAS fault codes using a scan tool, I was able to drive the vehicle without any warning lights coming back on. Thanks for your time and expert guidance — this helped me resolve the issue efficiently! The car is now running smoothly with all systems functioning properly.