OBD Guide
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C1117

Manual Trailer Brake Apply Request Signal 2 Malfunction

C1117 is an OBD-II diagnostic trouble code meaning: Manual Trailer Brake Apply Request Signal 2 Malfunction. Common causes: open or short circuit in wiring harness, malfunction of the brake system control unit. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Trailer manual braking system does not work
  • Error in the diagnostic system

Causes

  • Open or short circuit in wiring harness
  • Malfunction of the brake system control unit
  • Damage to connectors or contacts
  • Problems with the handbrake sensor or switch

How to Fix

  1. Check the wiring harness for damage
  2. Check connectors and contacts for corrosion or damage
  3. Test the handbrake sensor or switch
  4. Check the brake system control unit
  5. Replace faulty components if necessary

Related codes

C1116C1118C1120

FAQ

What does the C1117 code mean?

C1117 is an OBD-II diagnostic trouble code that indicates: Manual Trailer Brake Apply Request Signal 2 Malfunction

What causes a C1117 error code?

The most common causes of C1117 include: Open or short circuit in wiring harness; Malfunction of the brake system control unit; Damage to connectors or contacts; Problems with the handbrake sensor or switch.

How do I fix a C1117 diagnostic trouble code?

To fix C1117: Check the wiring harness for damage. Check connectors and contacts for corrosion or damage. Test the handbrake sensor or switch. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1117?

Limited driving only, diagnose soon

How much does it cost to fix C1117?

The estimated repair cost for C1117 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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