P2162 code meaning
Vehicle Speed Sensor A/B Correlation
Powertrain system Generic code P21xx codes Check engine light
What P2162 means
P2162 means two speed sources, A and B, disagree by more than the calibration permits although each circuit is electrically sound. Depending on the vehicle, A and B can be a transmission output sensor, a transfer case sensor or wheel sensors read through the ABS unit. No manufacturer documents P2162 publicly. GM shows how closely the sources are linked: when its transfer case sensor fails (P2160/P2161), the software substitutes driven-wheel speed multiplied by the axle ratio (18OBDG04). California's OBD rule names the vehicle speed sensor among inputs that must be checked for plausibility. Wrong tire size or axle ratio, a damaged tone wheel or debris on one sensor are typical causes. Speedometer, shifting, cruise control and 4WD may suffer.
P2162 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2162
- Check engine lamp
- Speedometer reading wrong or unsteady
- Harsh or mistimed shifts, possibly a fixed-gear fallback
Common causes of P2162
- Most likelyTire size or axle ratio differs from the programmed values
- PossibleMetal debris or damage on one of the two sensors
- PossibleDamaged or wrong tone wheel on one shaft or hub
- Less likelyWheel speed signal from the ABS unit faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Vehicle speed sensorVehicle speed sensor b
What each part of P2162 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 62 | The exact fault in that area. |
What to do next
- Note P2162 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2162
What does P2162 mean?
P2162 means "Vehicle Speed Sensor A/B Correlation". P2162 means two speed sources, A and B, disagree by more than the calibration permits although each circuit is electrically sound. It is a generic code, so it means the same on every make.
Is it safe to drive with P2162?
Drive gently and only to a workshop. With P2162 the car can go into limp mode (reduced power) to protect itself.
Will P2162 fail an emissions test?
Yes, it can. P2162 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2162 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2162 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.