P0820

Gear Lever X-Y Position Sensor Circuit

Transmission / shifter controls Generic OBD-II Medium

What it means

P0820 means the transmission control module detected a fault in the gear lever X-Y position sensor circuit. This sensor reports the shift lever's position — which gear you've selected — using two axes. When its signal is unreliable, the TCM can't be sure of the selected gear, so the transmission may enter fail-safe, and on shift-by-wire vehicles the car may refuse to start or move until Park or Neutral is confirmed.

Medium

Can I keep driving? May enter fail-safe and shift poorly, and on shift-by-wire vehicles the car can refuse to start or move — address it before it strands you.

Real-world scan data

Seen in

350

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0820 scans

P0101in 30.6% of scans

P0113in 18.6% of scans

U1111in 16.9% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Difficulty selecting or shifting gears
Wrong or missing gear indication on the display
Transmission enters fail-safe / limp mode
Check-engine light on
On shift-by-wire vehicles, the car may not start or move until Park/Neutral is confirmed

Common causes

Most likely first

Faulty gear lever X-Y position sensorLikely
Damaged or broken wiring in the sensor circuitCommon
Loose or corroded electrical connectionsCommon
Failed transmission control module (TCM)Less often

How to diagnose & fix

Work through it in order

Inspect the gear lever position sensor connector and wiring for damage or corrosion.
Check the sensor outputs across each lever position with a scan tool.
Perform a shifter calibration / relearn if the vehicle requires it.
Replace the gear lever X-Y position sensor if its readings are out of spec.
Evaluate the TCM last. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0820?+

Be cautious. The transmission may enter fail-safe, and on shift-by-wire vehicles the car can refuse to start or move if it can't confirm the selected gear. Have it addressed promptly.

Can I just clear P0820?+

You can, but it returns until the sensor or wiring is repaired, since the TCM needs a valid lever-position signal to know what gear you've selected.

Read & clear P0820 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX