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DTC codes / P23xx · Ignition system and misfire / P23CB

P23CBFuel Rail Heater Control Circuit Low

P23CB indicates that the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for the fuel rail heater, which is used on some diesel engines to warm the fuel in the rail for better cold-start performance and combustion stability. The PCM commands the heater on and monitors the circuit; when the voltage on the control wire stays below the expected threshold, it sets this code.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage