What Does B2305 Mean?
This code indicates the Body Control Module (BCM) or Seat Control Module has detected a short to ground in the feedback potentiometer circuit for the power-adjustable headrest system. The potentiometer provides position feedback to the module so it knows when the headrest has reached the commanded position. The module detected voltage below the expected range, indicating the signal wire is shorted to ground or the potentiometer itself has failed internally.
Common Causes
40%
Damaged or chafed wiring in the seat harness causing intermittent or permanent short to ground, typically where harness flexes at seat base
30%
Failed headrest position feedback potentiometer with internal short to ground
20%
Corroded or moisture-contaminated connector pins at headrest module or BCM causing ground path
10%
Faulty seat control module with internal short circuit on potentiometer input circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of seat wiring harness from headrest down to seat base, checking for pinched, chafed, or damaged wires especially at flex points. Look for signs of moisture intrusion in connectors.
2
Step 2: Disconnect the headrest potentiometer connector and measure resistance between the signal wire terminal and ground with a digital multimeter. Should read open circuit (infinite resistance); any measurable resistance indicates a wiring short to ground.
3
Step 3: With connector still disconnected, measure potentiometer resistance between signal and ground pins directly at the potentiometer. Typical range is 1k-10k ohms depending on position. Out-of-range or zero ohms indicates failed potentiometer.
4
Step 4: If wiring and potentiometer test good, check for voltage supply and ground at the potentiometer connector with ignition on. Should see 5V reference voltage on signal wire with connector plugged in and module commanding headrest movement.
5
Step 5: Wiggle and manipulate wiring harness while monitoring circuit resistance or live data on scan tool to identify intermittent short conditions during seat/headrest movement.
6
Step 6: Clear codes, cycle headrest through full range of motion, and verify code does not return. Monitor live data for smooth potentiometer voltage sweep from approximately 0.5V to 4.5V through full 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 a short to ground in the feedback potentiometer circuit for the power-adjustable headrest system. The potentiometer provides position feedback to the module so it knows when the headrest has reached the commanded p...
The most common cause of B2305 (Seat Headrest Feedback Potentiometer Circuit Short to Ground) is: Damaged or chafed wiring in the seat harness causing intermittent or permanent short to ground, typically where harness flexes at seat base
Typical repair costs for B2305 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle safety or drivability. The power headrest adjustment feature will be inoperative or function erratically, but the vehicle remains safe to drive. 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 B2305 to identify the root cause.
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Quick Info
Category
Body
System
Body Comfort and Convenience Systems
Difficulty
Type
Generic (SAE)
Recommended Tools
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