Heated Catalyst Heater Power Supply Open Circuit Bank 1
BMW · emissions
Data confidence62%
The control module detected an interruption (open circuit) in the Heated Catalyst Heater Power Supply circuit, so the expected electrical continuity was not present. This is the manufacturer-specific definition used by BMW.
Evaporative emission (EVAP) canister purge system (fuel tank system) - leak detected
Honda · emissions
Data confidence80%
The control module detected a condition consistent with a leak affecting the Evaporative emission (EVAP) canister purge system (fuel tank system). This is the manufacturer-specific definition used by Honda.
Evaporative emission (EVAP) canister purge system - very small leak
Nissan · emissions
Data confidence62%
The control module detected a condition consistent with a leak affecting the Evaporative emission (EVAP) canister purge system - very small. This is the manufacturer-specific definition used by Nissan.
A/C Compressor Control
Porsche · climate_control
Data confidence62%
The control module detected a fault associated with the A/C Compressor Control circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Porsche.
The control module detected that the EGR valve initialisation is jammed or locked. Documented for the Magneti Marelli MM6KP engine ECU (EW7A/EW10A) on Peugeot applications; the same PSA control units are also fitted to Citroën models.
Exhaust gas recirculation temperature (EGRT) control, Bank 1 - control limit reached
VAG · emissions
Data confidence62%
The control module detected that the monitored Exhaust gas recirculation temperature (EGRT) control, Bank 1 - control value reached its permissible limit. This is the manufacturer-specific definition used by Audi.
Possible causes
EGRT sensor
Applies toAudi
P1456
Exhaust gas recirculation temperature (EGRT) control, control limit reached
VAG · emissions
Data confidence80%
The control module detected that the monitored Exhaust gas recirculation temperature (EGRT) control, control value reached its permissible limit. This is the manufacturer-specific definition used by Volkswagen.
Powertrain: engine, transmission and driveline systems.
1
Manufacturer-defined range: the meaning can differ between brands.
456
Specific fault index within the subsystem.
Frequently asked questions about P1456
What does P1456 mean?
Diagnostic Trouble Code (7 interpretations). The control module detected an interruption (open circuit) in the Heated Catalyst Heater Power Supply circuit, so the expected electrical continuity was not present. This is the manufacturer-specific definition used by BMW.
Is P1456 generic or manufacturer-specific?
P1456 is a manufacturer-specific code. In this database it is documented for: BMW, Honda, Nissan, Porsche, PSA, VAG. The same number can mean something different on other brands.
Can TuningBot remove P1456 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
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BMW
Honda
Nissan
Porsche
PSA
VAG