P062C
Internal Control Module Vehicle Speed Performance
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.
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.
Related codes
Often seen with P062C
Read & clear P062C yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX