OBD Guide
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B2156

Rear Doppler Sensor Circuit Failure

B2156 is an OBD-II diagnostic trouble code meaning: Rear Doppler Sensor Circuit Failure. Common causes: open or short circuit in wiring harness, rear doppler sensor malfunction. Estimated repair cost: $111–333.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$111–333 (est.)

Symptoms

  • Malfunction indicator (Check Engine or SRS) is on
  • The passive safety system may not work in an emergency situation
  • The error is diagnosed by an OBD-II scanner

Causes

  • Open or short circuit in wiring harness
  • Rear Doppler sensor malfunction
  • Problems with the restraint control module
  • Corrosion of contacts or connectors

How to Fix

  1. Check wiring harness for damage
  2. Check contacts and connectors for corrosion
  3. Check the rear Doppler sensor using diagnostic equipment
  4. Replace sensor or wiring harness if necessary
  5. Reset the error and check the system operation

Related codes

B2155B2157B0100

FAQ

What does the B2156 code mean?

B2156 is an OBD-II diagnostic trouble code that indicates: Rear Doppler Sensor Circuit Failure

What causes a B2156 error code?

The most common causes of B2156 include: Open or short circuit in wiring harness; Rear Doppler sensor malfunction; Problems with the restraint control module; Corrosion of contacts or connectors.

How do I fix a B2156 diagnostic trouble code?

To fix B2156: Check wiring harness for damage. Check contacts and connectors for corrosion. Check the rear Doppler sensor using diagnostic equipment. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2156?

Do not drive — repair immediately

How much does it cost to fix B2156?

The estimated repair cost for B2156 is $111–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat