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TuningBot DTC Database · v4.37.15

P1738 Diagnostic Trouble Code (5 interpretations)

5 manufacturer-specific interpretations across 5 manufacturers in the TuningBot DTC database.

P · PowertrainTransmissionOBD2
Brand pages:BMWHondaHyundaiMazdaPSA

BMW

1 interpretation
P1738
Pressure Control Solenoid C Electrical BMW · transmission Data confidence 62%

The control module detected a fault associated with the Pressure Control Solenoid C Electrical circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by BMW.

Recommended checks

  • Perform a full module scan
  • Review freeze-frame and occurrence data
  • Compare commanded and measured values
  • Check applicable OEM service information

Honda

1 interpretation
P1738
Automatic transmission Honda · engine Data confidence 80%

The control module detected a fault associated with the Automatic transmission circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Honda.

Possible causes

  • Wiring
  • clutch pressure switch 2
  • ECM

Hyundai

1 interpretation
P1738
Shift System Timeout Hyundai · engine Data confidence 62%

The control module did not receive the expected response for Shift System within the allowed time. This is the manufacturer-specific definition used by Hyundai.

Mazda

1 interpretation
P1738
Shift time error Mazda · engine Data confidence 80%

The control module registered the fault condition described as "Shift time error". This is the manufacturer-specific definition used by Mazda.

Possible causes

Mechanical fault

PSA

1 interpretation
P1738
Gearbox input speed signal fault : Open circuit, short-circuit to the plus or short-circuit to earth PSA · transmission Data confidence 72%

The control module detected an interruption (open circuit) in the Gearbox input speed signal fault circuit. Documented for the MCP 6-speed piloted manual gearbox ECU on Peugeot applications; the same PSA control units are also fitted to Citroën models.

Applies to Peugeot MCP 6-speed piloted manual gearbox ECU

Related and nearby codes

P17 range
P1700P1701P1702P1703P1704P1705P1706P1707P1708P1709P170AP1710P1711P1712P1713P1714P1715P1716

How to read P1738

P

Powertrain: engine, transmission and driveline systems.

1

Manufacturer-defined range: the meaning can differ between brands.

738

Specific fault index within the subsystem.

Frequently asked questions about P1738

What does P1738 mean?

Diagnostic Trouble Code (5 interpretations). The control module detected a fault associated with the Pressure Control Solenoid C Electrical circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by BMW.

Is P1738 generic or manufacturer-specific?

P1738 is a manufacturer-specific code. In this database it is documented for: BMW, Honda, Hyundai, Mazda, PSA. The same number can mean something different on other brands.

Can TuningBot remove P1738 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

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Diagnostic Strategy and DTC Logic

ECU tuningDyno-tested results by model and engine See the results →

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