OBD Guide
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B16D1

Left DRL Lamp Control Circuit High

B16D1 is an OBD-II diagnostic trouble code meaning: Left DRL Lamp Control Circuit High. Common causes: short circuit in wiring harness, bcm control unit malfunction. Estimated repair cost: $22–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–167 (est.)

Symptoms

  • Left DRLs don't work
  • DRL lamps burn out
  • Headlight warning on panel

Causes

  • Short circuit in wiring harness
  • BCM control unit malfunction
  • Damage to DRL module
  • Contact corrosion
  • Incorrect post-repair connection

How to Fix

  1. Check the integrity of the wiring harness at the left headlight
  2. Check the DRL circuit for short circuit
  3. Check the power and control signals at the DRL connector
  4. Scan the BCM for additional errors
  5. Replace the DRL module if necessary
  6. Update BCM firmware (if required)

Related codes

B16D0B16D2B16D3U0155

FAQ

What does the B16D1 code mean?

B16D1 is an OBD-II diagnostic trouble code that indicates: Left DRL Lamp Control Circuit High

What causes a B16D1 error code?

The most common causes of B16D1 include: Short circuit in wiring harness; BCM control unit malfunction; Damage to DRL module; Contact corrosion.

How do I fix a B16D1 diagnostic trouble code?

To fix B16D1: Check the integrity of the wiring harness at the left headlight. Check the DRL circuit for short circuit. Check the power and control signals at the DRL connector. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B16D1?

Limited driving only, diagnose soon

How much does it cost to fix B16D1?

The estimated repair cost for B16D1 is $22–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat