What Does B1955 Mean?
This code indicates the Body Control Module (BCM) or Seat Control Module has detected an open circuit in the feedback potentiometer for the front seat height adjustment motor. The potentiometer provides position feedback to the control module so it knows when the seat has reached the desired height. An open circuit means no signal is being received, preventing proper seat height adjustment operation.
Common Causes
45%
Broken or damaged wiring harness between seat control module and height adjustment potentiometer, often caused by seat movement wear
30%
Failed potentiometer internal to the seat height adjustment motor assembly
15%
Corroded or loose connector pins at the seat motor or control module
10%
Failed seat control module or internal circuit board fault
Diagnostic Steps
1
Step 1: Perform visual inspection of the seat height motor wiring harness underneath the seat for chafing, cuts, or damage from seat track movement. Inspect all connectors for corrosion, pushed-back pins, or moisture intrusion.
2
Step 2: Using a digital multimeter, backprobe the potentiometer feedback signal wire at the motor connector while moving the seat up and down manually. Expected reading should be a smoothly changing voltage between 0.5V and 4.5V (typical range). No change or infinite resistance indicates open circuit.
3
Step 3: Disconnect the seat height motor connector and measure resistance across the potentiometer terminals (typically three wires: 5V reference, ground, and signal). Expected resistance should be 1-10k ohms and change smoothly when motor shaft is rotated. Open circuit reading confirms failed potentiometer.
4
Step 4: If potentiometer tests good, check continuity of all wiring from motor connector to seat control module connector. Repair any open circuits, damaged wires, or loose terminals found.
5
Step 5: If all wiring and potentiometer test normal, test 5V reference voltage supply from control module. Should measure 4.5-5.5V. No voltage indicates control module fault.
6
Step 6: After repairs, clear codes, cycle seat height adjustment through full range of motion multiple times, and verify code does not return and potentiometer feedback voltage changes smoothly throughout travel.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) or Seat Control Module has detected an open circuit in the feedback potentiometer for the front seat height adjustment motor. The potentiometer provides position feedback to the control module so it knows when the seat has reached the desired height....
The most common cause of B1955 (Seat Front Up/Down Potentiometer Feedback Circuit Open) is: Broken or damaged wiring harness between seat control module and height adjustment potentiometer, often caused by seat movement wear
Typical repair costs for B1955 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is safe to continue driving as it only affects seat height adjustment comfort features. The seat will remain in its current position and all other vehicle safety systems are unaffected. Repair can be scheduled at convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1955 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Body
System
Power Seat Control System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
