Chassis Codes (C-Codes): Full List
Chassis codes start with C and come from the ABS, traction and stability control, steering and suspension systems. They often switch on the ABS, traction or stability warning light rather than the check engine light. The most common trigger is a wheel speed sensor or its wiring, but because these systems affect braking and steering, repairs belong in a shop.
37Codes
3.1Average severity
16%High or critical
14%DIY-friendly
Severity distribution
Most viewed
C0035
Chassis
The ABS module lost a valid signal from the driver-side front wheel speed sensor.
Moderate
C0021
Chassis
The brake module thinks the power brake booster isn't giving the assist it should. Check pedal…
High
C0561
Chassis
GM's brake or chassis module switched off stability/traction control because of a fault…
Low
C0161
Chassis
The GM brake module gets a brake-light switch signal that doesn't make sense. Check your brake…
Moderate
C0131
Chassis
The GM brake module sees an implausible or out-of-range signal from the brake pressure sensor.
Moderate
C0040
Chassis
The ABS module isn't getting a usable signal from the passenger-side front wheel speed sensor.
Moderate
All codes (6)
C0021
Chassis
The brake module thinks the power brake booster isn't giving the assist it should. Check pedal…
High
C0545
Chevrolet · Chassis
The electric power steering module can't trust its torque sensor, so steering assist may cut…
High
C1252
Toyota · Chassis
The brake pressure pump ran far longer than normal without reaching or holding its target…
High
C1256
Toyota · Chassis
The brake system's high-pressure accumulator is below its minimum, so power brake assist can't…
Critical
C1391
Toyota · Chassis
The hybrid brake system is losing stored hydraulic pressure internally, so the pump keeps…
High
C2217
Jeep · Chassis
The electric power steering module found a fault inside itself and may reduce or cut steering…
High