OBD Guide
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B2157

Front Doppler Sensor Circuit Failure

B2157 is an OBD-II diagnostic trouble code meaning: Front Doppler Sensor Circuit Failure. Common causes: open or short circuit in wiring harness, doppler sensor malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Disabling the adaptive cruise control system
  • Dashboard warning
  • Reduced security system functionality

Causes

  • Open or short circuit in wiring harness
  • Doppler sensor malfunction
  • Problems with power or grounding of the sensor
  • Software error in control module

How to Fix

  1. Check the wiring harness for damage
  2. Check the power supply and grounding of the sensor
  3. Test the Doppler sensor
  4. Update control module software
  5. Replace sensor if necessary

Related codes

B2158B2159C1234

FAQ

What does the B2157 code mean?

B2157 is an OBD-II diagnostic trouble code that indicates: Front Doppler Sensor Circuit Failure

What causes a B2157 error code?

The most common causes of B2157 include: Open or short circuit in wiring harness; Doppler sensor malfunction; Problems with power or grounding of the sensor; Software error in control module.

How do I fix a B2157 diagnostic trouble code?

To fix B2157: Check the wiring harness for damage. Check the power supply and grounding of the sensor. Test the Doppler sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2157?

Do not drive — repair immediately

How much does it cost to fix B2157?

The estimated repair cost for B2157 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat