C0269 on Chevrolet: How to Diagnose & Fix
Excessive Dump/Isolation Time
1 Chevrolet model · 1 documented issue · 1 critical · $300-$900 repair
C0269 on Chevrolet by model: symptoms, diagnosis and fix
The Electronic Brake Control Module (EBCM) mounted on the ABS hydraulic unit is prone to failure due to internal solder joint cracking from vibration and thermal cycling. When it fails, ABS, traction control, and stability control all stop functioning. The brake warning light, ABS light, and traction control light all illuminate.
Common Symptoms
- ABS light on
- Traction control light on
- Service stability system message
- Loss of ABS function
- Brake pedal pulsation during normal braking
How to Fix
The EBCM can be sent to a rebuilder for solder repair and reprogramming, which is more affordable than dealer replacement. Alternatively, replace the ABS modulator assembly. After replacement, the module must be programmed to the vehicle VIN. Bleeding the ABS system requires a scan tool to cycle the pump and valves.
Sources for this issue (1)
C0269 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C0269 mean on a Chevrolet?
C0269 stands for "Excessive Dump/Isolation Time." This code, common on GM vehicles, sets when the ABS module commands the dump or isolation valves to release/hold brake pressure for too long (typically more than several seconds) on one or more wheels. The dump valve releases pressure to prevent wheel lockup and the isolation valve holds pressure on a circuit; excessive activation usually means the system is reacting to a wheel that is locking or to a bad wheel-speed reading. The module disables ABS, traction, and stability control and lights the warnings. The root cause is frequently a dirty/faulty wheel speed sensor or a mechanically dragging/locking brake rather than the valves themselves. On Chevrolet it is documented across 1 model: Monte Carlo.
What are the most common causes of C0269?
The most common causes of C0269 are: Dirty or faulty front wheel speed sensor (most common), Mechanically locking or dragging brake/caliper, Debris at the sensor/tone ring causing false readings, Damaged tone (reluctor) ring, Sticking dump/isolation solenoid valve in the ABS unit, Wiring/connector corrosion at a wheel sensor, Internal EBCM/hydraulic unit fault. The specific cause varies by vehicle.
How much does it cost to fix C0269 on a Chevrolet?
Published repair estimates on Chevrolet range from $300 to $900 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for C0269 on a different make?
View C0269 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.