Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a part of the car's computer that helps control the brakes. It's like when a toy with a remote control doesn't work because the remote has a problem.
The C1091 code indicates an electrical issue within the Dynamic Stability Control (DSC) module, specifically related to the valve coil 'H' circuit.
The DSC control module is responsible for managing the vehicle's stability by adjusting braking pressure on individual wheels. The valve coil 'H' circuit is part of this system, and an electrical fault in this circuit can affect the module's ability to function correctly.
• ABS warning light on the dashboard
• Loss of traction control
• Unusual braking behavior
• Faulty DSC control module
• Damaged wiring or connectors in the valve coil circuit
• Blown fuse related to the DSC system
DSC: Dynamic Stability Control
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code
• Inspect the wiring and connectors related to the DSC module
• Check the fuses associated with the DSC system
• Replace or repair damaged wiring or connectors
• Replace the faulty DSC control module
• Replace any blown fuses
• OBD-II scanner
• Multimeter
• Screwdriver set
$200 - $800
Moderate
• BMW 3 Series
• Ford Focus
• Mazda CX-5
• Regularly inspect and maintain the braking system
• Ensure electrical connections are secure
• Avoid driving through deep water
Electrical Circuit Issue
• Do not ignore the ABS warning light
• Have the braking system inspected by a professional
• Avoid hard braking until the issue is resolved
Check with the vehicle manufacturer for specific warranty coverage related to the DSC system.
This code has been more prevalent in vehicles with advanced stability control systems introduced in the early 2000s.
High – This issue can affect the vehicle's braking performance and safety.
Driving with a malfunctioning DSC system can be dangerous. It is advised to address the issue promptly to ensure vehicle safety.
• Vehicle parked on a level surface
• Engine off and ignition in the 'on' position
The DSC control module is typically located near the brake master cylinder or in the engine compartment.
Q: Can I drive my car with this code?
A: It's not recommended to drive with this issue as it can affect your vehicle's braking performance.
Q: How do I reset the ABS light?
A: The ABS light can be reset by fixing the underlying issue and using an OBD-II scanner to clear the code.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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