B2156
Low Severity (Level 2)Rear Doppler Sensor Circuit Failure
B2156 usually means rear Doppler Sensor Circuit Failure.
Can you still drive with B2156?
⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
Typical repair cost: $50 – $600
Severity Level 2 — Low
This code indicates a minor issue that is unlikely to cause immediate driveability problems. You can typically continue driving but should have the vehicle inspected at your earliest convenience.
Common Symptoms
- Body electronics not functioning as expected
- Warning light or message on dashboard related to the body control/comfort system
- Diagnostic trouble code (DTC) stored in module memory
- Fault may be intermittent — code may clear itself and reappear
- Reduced vehicle functionality related to the body control/comfort system
Possible Causes
- Failed body control module or actuator — internal fault from age, heat cycling, and vibration
- Damaged wiring or corroded connector in the body control/comfort system circuit
- Blown fuse for the body control/comfort system circuit — check before replacing components
- Faulty control module/PCM
- Loose or corroded ground point shared by the body control/comfort system
Common Fixes
- Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($11-90 at shop, free at auto parts store for basic scan)
- Visually inspect the body control/comfort system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $107 diagnostic fee at shop)
- Replace body control module or actuator if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($50-600)
- Check and replace any blown fuses in the body control/comfort system fuse circuit — if fuse blows again, there's still a short that needs to be found ($2-14 for fuses)
- Perform a wiggle test on the body control/comfort system wiring harness while monitoring live data — see if the fault returns when you move the harness at different points ($0-138 diagnostic labor)
Estimated Repair Cost
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Frequently Asked Questions
What does B2156 mean?
B2156 stands for "Rear Doppler Sensor Circuit Failure". B2156 usually means rear Doppler Sensor Circuit Failure.
Can you drive with B2156?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix B2156?
Repair costs for B2156 typically range from $50 to $600, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($11-90 at shop, free at auto parts store for basic scan); Visually inspect the body control/comfort system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $107 diagnostic fee at shop); Replace body control module or actuator if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($50-600).
Will B2156 clear itself?
Explore Repair Costs
Related OBD-II Codes
These codes are in the same range as B2156 and often share similar causes and fixes.
Worried about repair costs?
Get transparent estimates and verify your mechanic's quote before authorizing repairs.
Related Discussions
See what other car owners are saying about this code and related repairs.
View B2156 discussions in the community