Faulty or dirty wheel speed sensor or transmission output speed sensor; Damaged wiring, poor connections or corrosion in the speed signal circuit; Other fault codes affecting the speed signal, such as an ABS module or CAN communication fault; Incorrect tyre size or a mismatch in the speed calibration after changes or repairs; Damaged tone ring or reluctor wheel giving a poor signal; Fault inside the engine control module or a related module; Outdated or faulty control module calibration, where the manufacturer has identified it as a known cause.

P062C

Internal Control Module Vehicle Speed Performance.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
6: AreaComputer and output circuits
2C: FaultThe specific fault in that area

What it means

P062C is a generic code meaning the engine control module has found a performance problem with the vehicle speed information it uses internally. The module monitors the vehicle speed signal it receives, normally from the ABS, transmission or a dedicated speed sensor, and compares it with other data such as engine speed, gear and wheel speed. If the values disagree or the signal is implausible, the code is set.

Symptoms

Speedometer reading erratic, stuck or not working
Warning light on, possibly with ABS or traction control lights
Cruise control or speed limiter not working
Poor or erratic gear changes on automatic models
Rough idle or hesitation, as speed-dependent functions misbehave
Engine running in a reduced-performance mode

Possible causes

Faulty or dirty wheel speed sensor or transmission output speed sensorlikely
Damaged wiring, poor connections or corrosion in the speed signal circuitlikely
Other fault codes affecting the speed signal, such as an ABS module or CAN communication faultpossible
Incorrect tyre size or a mismatch in the speed calibration after changes or repairspossible
Damaged tone ring or reluctor wheel giving a poor signalpossible
Fault inside the engine control module or a related modulerare
Outdated or faulty control module calibration, where the manufacturer has identified it as a known causerare

How to diagnose

Read all stored and pending codes from every module and note any ABS, transmission or network codes, then review the freeze frame data.
Compare the speed shown on the scan tool with the real speed and with each wheel speed reading on a road test.
Visually inspect the wheel speed sensors, transmission speed sensor, their wiring and connectors for damage, contamination, water or corrosion.
Check tyre sizes and condition, and confirm they match the vehicle specification.
Inspect the tone rings or reluctor wheels for damage, rust build-up or missing teeth.
Check the sensor supply, ground and signal circuits using a multimeter or oscilloscope against the manufacturer's specification.
Check for network communication faults and look for relevant technical service bulletins or calibration updates for the model and engine.
Clear the codes and retest to see if the fault returns before replacing any control module.

How to fix

Clean or replace the faulty speed sensor, as confirmed by testing.
Repair or replace damaged wiring and connectors in the speed signal circuit.
Replace a damaged tone ring or reluctor wheel.
Fit the correct tyre size or correct the speed calibration where it is wrong.
Repair any related ABS or network faults found, then recheck for the code.
Update the control module calibration only if the manufacturer identifies an outdated one as the cause, or repair or replace the module as a last resort.

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but book it in soon as the speedometer, cruise control and gear changes may be affected. If ABS or traction control warnings also appear, take extra care and have it checked promptly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.