P0CA1
Drive Motor Control Module Requested MIL Illumination
The drive motor control module has requested MIL illumination via the inter-module bus. Underlying fault is reported separately.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Common causes
Ordered by how often each turns out to be the cause.
- Downstream fault in drive motor systemCommon
- Communication lagPossible
Parts involved
- Drive Motor Control Module
- Module Communication Bus
P0CA1 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.