Powertrain
Definition only
Lights the check engine lamp
P2A4B: Alternative Fuel Temperature Sensor Circuit
Standardized SAE J2012 code · P2Axx codes
What does P2A4B mean?
The AFCM detects a generic fault on the alternative fuel temperature sensor. Fuel viscosity and density compensation cannot be applied reliably.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Temperature sensor failed
- Medium Wiring or connector fault
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2A4B on the same make and model first.
P2A4B in the community
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