What Does C1126 Mean?
This code indicates the cruise control module or body control module has detected a circuit failure in the cruise control command switch assembly. The command switch, located on the steering wheel or stalk, sends signals for set, resume, accelerate, coast, and cancel functions. A circuit failure means the module is receiving no valid signal or an out-of-range signal from the switch assembly.
Common Causes
35%
Failed cruise control command switch assembly due to worn internal contacts or cracked circuit board from repeated use
25%
Damaged clockspring (spiral cable) in the steering column that carries switch signals from the rotating steering wheel to the stationary harness
20%
Corroded or loose wiring connections at the clockspring, multifunction switch connector, or control module
15%
Broken or chafed wires within the steering column harness from steering wheel rotation wear
5%
Control module internal failure on the cruise switch input circuit
Diagnostic Steps
1
Step 1: Test cruise control switch functionality by measuring resistance across switch terminals at the clockspring connector while pressing each cruise button. Each position should produce a distinct resistance value per the wiring diagram.
2
Step 2: Inspect the clockspring connector at the base of the steering column for corrosion, bent pins, or loose fit. Wiggle test while monitoring switch signals in live data.
3
Step 3: If switch readings are correct at the clockspring, check wiring continuity from the clockspring connector to the cruise control module or BCM. Test for opens, shorts to ground, and shorts to battery.
4
Step 4: If the clockspring is suspect, measure continuity through the clockspring by checking resistance from the steering wheel connector to the column base connector while slowly turning the wheel lock-to-lock. Any intermittent open indicates clockspring failure.
5
Step 5: Clear codes and verify cruise control operation through all functions (set, resume, accel, coast, cancel, off).
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
This code indicates the cruise control module or body control module has detected a circuit failure in the cruise control command switch assembly. The command switch, located on the steering wheel or stalk, sends signals for set, resume, accelerate, coast, and cancel functions. A circuit failure mea...
The most common cause of C1126 (Cruise Control Command Switch Assembly Circuit Failure) is: Failed cruise control command switch assembly due to worn internal contacts or cracked circuit board from repeated use
Typical repair costs for C1126 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cruise control will not function but all other vehicle systems remain unaffected. Vehicle is safe to drive. Repair at convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1126 to identify the root cause.
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Quick Info
Category
Chassis
System
Cruise Control System
Difficulty
Type
Manufacturer
Recommended Tools
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