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P2B78
Coolant Heater B Control Circuit High
Generic · engine
Data confidence
65%
The control module detected that the signal in the Coolant Heater B Control circuit stayed above the expected operating range.
TuningBot DTC Database · v4.37.15
P2B78 Coolant Heater B Control Circuit High
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P2B78 means
Related and nearby codes
How to read P2B78
P
Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
B78
Specific fault index within the subsystem.
Frequently asked questions about P2B78
What does P2B78 mean?
Coolant Heater B Control Circuit High. The control module detected that the signal in the Coolant Heater B Control circuit stayed above the expected operating range.
Is P2B78 generic or manufacturer-specific?
P2B78 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P2B78 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic