C008A – Traction Control Mode Control (OBD2)
C008A means "Traction Control Mode Control". These codes mean the control module has detected a fault in a warning lamp circuit (ABS, brake, tyre pressure, traction or stability lamps) or in a driver switch such as the traction control off button.
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C008A quick summary
| Fault code | C008A |
|---|---|
| Meaning | Traction Control Mode Control |
| System | Chassis |
| Vehicles | Generic OBD2 |
| Severity | Low |
| Can I drive? | Yes. Braking is not affected, but make sure the important warning lamps work – you would not be warned about ABS or brake faults otherwise. |
| Repair cost | €0 – €300 |
What chassis warning lamp and switch codes mean
The ABS/ESP module controls several warning and status lamps, either directly or via the instrument cluster, and reads driver switches such as the ESP/traction control off button or a mode selector. Faults in these circuits are stored so that the driver is not left without warnings.
On modern cars most lamps are controlled over the CAN bus, so faults are often in the instrument cluster or the communication rather than in a bulb. A stuck traction control button can also switch the system off permanently.
These faults do not affect braking directly, but a warning lamp that does not work is a safety and inspection issue.
C008A is a chassis code in the standard (SAE) numbering. Some manufacturers – for example GM, Opel and Ford on certain models – use their own meanings for some C codes, so always check the text your scan tool shows for your vehicle.
Symptoms of C008A
- Warning lamp does not light during the bulb check
- Warning lamp stays on permanently
- Traction control cannot be switched on or off
- ESP off message without pressing the button
- Failed inspection (warning lamp not working)
Most common causes of C008A (most likely first)
Mechanic's Pro Tip
If ESP switches itself off, watch the ESP button in live data – a sticky button reported as pressed is a cheap fix that is often overlooked.
1.Stuck or faulty traction control / ESP button
Most likely2.Instrument cluster fault
3.Wiring or connector fault
4.CAN bus communication fault
5.Liquid spilled on switches in the centre console
Step-by-step diagnostic guide
- 1
Do a bulb check
Switch on the ignition and check that the ABS, brake, ESP and tyre pressure lamps light up briefly.
- 2
Read codes in all modules
Read the ABS/ESP module and the instrument cluster.
- 3
Check switch inputs
Watch the switch status in live data while pressing the button; it must change and return.
- 4
Check wiring and communication
Check the wiring to the switch and cluster and look for CAN communication codes.
- 5
Repair and verify
Replace the switch or repair the wiring/cluster and repeat the bulb check.
Frequently asked questions
Can I keep driving with C008A?
Yes. Braking is not affected, but make sure the important warning lamps work – you would not be warned about ABS or brake faults otherwise.
How much does it cost to fix C008A?
Typical repair costs are 0 € – 300 €, depending on the cause and the vehicle. The most common fixes are: stuck or faulty traction control / ESP button; instrument cluster fault; wiring or connector fault. Always confirm the cause with the tests above before buying parts.
Is a warning lamp circuit code serious?
It does not affect braking, but you would not be warned about other faults. Have it repaired, especially before an inspection.
Why can't I switch traction control off?
The switch or its circuit may be faulty, or the module has disabled the function because of another fault.
What is the difference between C008A and similar codes?
C008A belongs to a group of codes for the same component that differ in the type or location of the fault: C0082 – Brake System Malfunction Indicator; C0083 – TPMS Malfunction Indicator; C0084 – Traction Active Indicator; C0085 – Traction Disable Indicator; C0086 – Vehicle Dynamics Indicator; C0089 – Traction Control Disable Switch. The tests on this page apply to the whole group; the type of fault tells you where to start.
Related fault codes
This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.