Skip the auto shop - Our mechanics make house calls

C1102 OBD-II Trouble Code: ABS Acceleration Switch Circuit Failure

check engine light

C1102 code definition

A C1102 trouble code indicates that the vehicle's Engine Control Unit (ECU) has detected an unspecified failure in the acceleration switch circuit of the Antilock Braking System (ABS).

What the C1102 code means

The antilock braking system is a feature in modern cars, designed to minimize wheel slippage and improve traction. The acceleration switch regulates the ABS settings relative to the performance of the engine. If the acceleration switch has suffered an unspecified failure, this will potentially disable the feature, although regular car brakes should continue to function normally.

What causes the C1102 code?

If your vehicle is suffering from a C1102 code, the issue may lie with a faulty ABS sensor. Corroded, damaged, faulty and otherwise poorly installed circuitry may be to blame for this circuit failure. In some rare cases, the ECU itself may be faulty, mistakenly reporting the trouble code as a result. Because ECUs seldom report trouble codes falsely, it should only be considered as a possibility once the more plausible concerns have been exhausted.

What are the symptoms of the C1102 code?

If the acceleration switch circuit has failed, the ABS will be unable to function properly. Depending on the severity of the issue, it may be completely disabled. Traction may be stiff while the vehicle accelerates or decelerates quickly. Regular, unaided braking should continue to function normally unless more brake-related codes are present. In addition to the practical concerns of an acceleration switch failure. Moreover, the C1102 code will be accompanied by an illuminated check engine light on the vehicle's dashboard, as well as a stored trouble code in the ECU that can be read using an OBD-II scanner. These symptoms are present in a purely diagnostic context, and may be disregarded once the specific issue has been identified.

How does a mechanic diagnose the C1102 code?

The C1102 code is first diagnosed by reading the code using an OBD-II scanner on the vehicle's ECU. ABS sensors (as well as other ABS-related components) should be checked for potential faultiness. Any electrical wiring and connectors should looked over for signs of disconnection, corrosion improper wiring/installation, damage and faultiness. Other diagnostic scanners such as the Autohex can be used to locate the source of the circuit issue.

Common mistakes when diagnosing the C1102 code

Chassis (or C-class) trouble codes may describe different issues depending on the make and model of vehicle in question. Your OBD-II scanner may specify the code description for you. Refer to the user manual if you're uncertain about something, and don't hesitate to reach out to a YourMechanic representative if you need assistance.

How serious is the C1102 code?

A C1102 code will likely disable the antilock braking system; it is strongly recommended against driving a vehicle without this feature working properly. Although it technically won't limit the function of the vehicle, it will handle differently without ABS traction, thereby significantly increasing the risk of accidents. A C1102 trouble code is considerably more serious if the vehicle is typically driven on less-than-optimal driving conditions and routes.

What repairs can fix the C1102 code?

If the acceleration switch is damaged or faulty, it should be replaced. Any electrical wiring and connectors that have been identified as broken, damaged or faulty should be replaced, repaired or rewired accordingly. In the rare event that the ECU has been identified as faulty, it will need to be reprogrammed or replaced altogether. Once you've made any necessary repairs to fix the ABS acceleration switch circuit, restart the vehicle. If the C1102 hasn't been properly solved yet, this will give the trouble code a chance to recur. In the event that the issue hasn't been solved, return to the diagnostic stage and see if there is anything you may have missed.

Additional comments for consideration regarding the C1102 code

The antilock braking system is present on the overwhelming majority of newer car models.

Need help with a C1102 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P0608 OBD-II Trouble Code: Control Module VSS Output "A" Malfunction
P0608 means there is an malfunction in the vehicle speed sensor A control module often due too faulty speed sensor or shorted electrical wiring.


Related questions

Q: Check engine light is on.. Its not running any differently and it starts normally..

You need to have the engine computer scanned to see what trouble code is stored. Not all codes will cause the engine to run bad or cause a noticeable problem. For instance, a trouble code could be triggered by a...

Q: Why would I still have a check engine light after my camshaft and crankshaft sensors were replaced 2008 Kia Sedona

If you are continuing to get the same codes after these sensors were replaced then you more than likely have a worn out timing belt. When the belt is worn then the sensors will not read correctly. If you want...

Q: C121C torque request signal denied and P0334 Cam shaft sensor

The cam sensor code (actually P0344), is known problem, and there is a Technical Service Bulletin (232460) that addresses this fault and repair. Check with your Dodge dealer to understand what the TSB covers or not. The C121C code has...