P062C

Internal Control Module Vehicle Speed Performance

Q: Is it safe to drive with P062C?

Drive only carefully. Speed-based functions like the speedometer, cruise, and transmission control may be unreliable, and the ECM may reduce power. Get it diagnosed soon.

Q: Can I just clear P062C?

It reflects an internal ECM self-check on the vehicle-speed data, so it returns until the speed-signal input or the module fault is corrected.

ECM internal Generic OBD-II High

What it means

P062C means the ECM's internal check of the vehicle speed signal failed a plausibility or performance test — the module cannot trust the speed data it is processing. Because speed feeds the speedometer, cruise control, and transmission strategy, several functions can be affected. It usually stems from the speed sensor circuit or an internal ECM fault.

High

Can I keep driving? Drive cautiously — the speedometer, cruise, and shifting may behave oddly, and the ECM may limit power; have it diagnosed promptly.

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
Inaccurate or dropping-out speedometer
Erratic or harsh transmission shifting
Cruise control disabled

Common causes

Most likely first

Vehicle speed sensor (VSS) or its wiring fault feeding the ECMLikely
Poor connection, bad ground, or reference-voltage problem at the ECMCommon
Internal ECM processor fault (module fails its own speed-signal check)Common

How to diagnose & fix

Work through it in order

Read freeze-frame data and check for related vehicle-speed codes (e.g. P0500/P0501).
Inspect the vehicle speed sensor and its wiring/connector for damage or corrosion.
Verify the ECM's power, grounds, and reference voltages are clean and within spec.
Reflash or update the ECM software if a service fix is available.
If the internal fault persists after the circuit checks out, replace or reprogram the ECM.

FAQ

Quick answers

Is it safe to drive with P062C?+

Drive only carefully. Speed-based functions like the speedometer, cruise, and transmission control may be unreliable, and the ECM may reduce power. Get it diagnosed soon.

Can I just clear P062C?+

It reflects an internal ECM self-check on the vehicle-speed data, so it returns until the speed-signal input or the module fault is corrected.

Read & clear P062C 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