Powertrain
Definition only
Lights the check engine lamp
P2DA4: Coolant Heater A Internal Control Module Performance
Standardized SAE J2012 code · P2Dxx codes
What does P2DA4 mean?
The internal control module of coolant heater A reports a performance fault. Internal self-tests fail.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Common causes
- High Internal module fault
- Medium Firmware corruption
- Low Module software outdated, reflash may resolve
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2DA4 on the same make and model first.
P2DA4 in the community
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