OBD Guide
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B17C5

Trailer Tow Reverse Lamp Control Circuit Short To Battery

B17C5 is an OBD-II diagnostic trouble code meaning: Trailer Tow Reverse Lamp Control Circuit Short To Battery. Common causes: wiring harness damage, short circuit in the circuit. Estimated repair cost: $56–167.

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

Symptoms

  • Trailer tail lights do not work when reversing
  • The malfunction indicator on the dashboard is on
  • Possible malfunctions in other electrical systems

Causes

  • Wiring harness damage
  • Short circuit in the circuit
  • Faulty relay or control module
  • Damage to the trailer connector
  • Incorrect trailer connection

How to Fix

  1. Check wiring harness for damage
  2. Check continuity with a multimeter
  3. Inspect the trailer connector for damage.
  4. Check the operation of the relay and control module
  5. Replace damaged components if necessary

Related codes

B17C4B17C6

FAQ

What does the B17C5 code mean?

B17C5 is an OBD-II diagnostic trouble code that indicates: Trailer Tow Reverse Lamp Control Circuit Short To Battery

What causes a B17C5 error code?

The most common causes of B17C5 include: Wiring harness damage; Short circuit in the circuit; Faulty relay or control module; Damage to the trailer connector.

How do I fix a B17C5 diagnostic trouble code?

To fix B17C5: Check wiring harness for damage. Check continuity with a multimeter. Inspect the trailer connector for damage.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B17C5?

Limited driving only, diagnose soon

How much does it cost to fix B17C5?

The estimated repair cost for B17C5 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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