TuningBot DTC Database · v4.37.15
10 manufacturer-specific interpretations across 9 manufacturers in the TuningBot DTC database.
DodgeThe control module detected a fault associated with the Vehicle Theft System Improper Password circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Dodge.
FordThe control module detected a fault associated with the Linear O2 Sensor Control Chip Bank 1 circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Ford.
Ford documents P1646:00 (no sub type information) for its 2024-2025 gasoline-engine OBD monitor strategy as linear o2 sensor control chip, bank 1. This three-byte interpretation is application-specific and identifies the detected monitor condition rather than a confirmed failed component.
HondaThe control module detected improper operation of the Motor control module (MCM). This is the manufacturer-specific definition used by Honda.
HyundaiThe control module detected that the Booster Voltage value was above the expected limit. This is the manufacturer-specific definition used by Hyundai.
JeepThe control module detected that the signal in the Engine coolant hydraulic blower motor solenoid/ circuit stayed above the expected operating range. This is the manufacturer-specific definition used by Jeep.
RenaultThe control module detected a fault associated with the Heater relay control 3 circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Renault.
SuzukiThe control module detected a fault associated with the Immobilizer information mismatched circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Suzuki.
VAGThe control module detected a fault associated with the Check DTC Memory Of All Wheel Drive ECU circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Volkswagen.
VolvoThe control module detected that the AIC relay signal stayed below the expected range. This is the manufacturer-specific definition used by Volvo.
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
Diagnostic Trouble Code (10 interpretations). The control module detected a fault associated with the Vehicle Theft System Improper Password circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Dodge.
P1646 is a manufacturer-specific code. In this database it is documented for: Dodge, Ford, Honda, Hyundai, Jeep, Renault, Suzuki, VAG, Volvo. The same number can mean something different on other brands.
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.
Understand the system behind this code: Oxygen Sensors (Lambda)
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