P2162

Vehicle Speed Sensor A/B Correlation

Q: Is it safe to drive with P2162?

The engine runs fine, but an unreliable speed signal can disable cruise control and cause odd shifting or an ABS light. It's drivable, but get it fixed before long trips.

Q: Can I just clear P2162?

It returns once the two sensors disagree again. You need to find which sensor or wire is wrong rather than just clearing it.

Vehicle speed / idle control Generic OBD-II Medium

What it means

P2162 sets when the PCM compares two vehicle-speed signals ("A" and "B") and finds they don't agree. The computer uses speed data for the speedometer, transmission shifting, cruise control, and stability systems, so a mismatch mainly affects those features rather than how the engine runs. The usual causes are a failing speed sensor, wiring or connector problems, or a damaged tone ring — not anything that stops the car from driving.

Medium

Can I keep driving? Drivable — the engine runs normally, but the speedometer, cruise control, and shift quality may misbehave, so fix it before relying on those.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

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

Check-engine light on
Erratic or inoperative speedometer
Harsh, delayed, or erratic shifting
Cruise control disabled
Possible ABS or traction-control warning light

Common causes

Most likely first

Faulty vehicle speed sensor (A or B)Likely
Open, shorted, or high-resistance sensor wiringCommon
Poor or corroded connection at a speed-sensor connectorCommon
Damaged reluctor/tone ring the sensor readsLess often
Fault in the ABS wheel-speed input feeding the signalLess often
Faulty PCM (least likely)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and scan for related speed-sensor and ABS codes.
Compare the live data from speed sensors A and B — the code sets when the two disagree.
Inspect both sensor connectors and wiring for opens, shorts, and corrosion.
Check the reluctor/tone ring for damage, debris, or a loose fit.
Replace the sensor that reads incorrectly; repair wiring as needed, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2162?+

The engine runs fine, but an unreliable speed signal can disable cruise control and cause odd shifting or an ABS light. It's drivable, but get it fixed before long trips.

Can I just clear P2162?+

It returns once the two sensors disagree again. You need to find which sensor or wire is wrong rather than just clearing it.

Read & clear P2162 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