Powertrain
Definition only
Lights the check engine lamp
P23CA: Fuel Rail Heater Control Circuit Open
Standardized SAE J2012 code · P23xx — Ignition system and misfire
What does P23CA mean?
The fuel rail heater - on common-rail diesels for cold-start - has an open control circuit. The rail cannot be heated, slowing cold-start fuel atomisation.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Open in heater or wiring
- Low Pin pushed back out of connector body
- Low Cracked solder joint inside the module or sensor
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P23CA on the same make and model first.
P23CA in the community
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