DTC Advanced Diagnostics: P0237, P0238 (1.5L Engine)
DTC P0237: Turbocharger Boost Sensor Circuit Low Voltage DTC P0238: Turbocharger Boost Sensor Circuit High Voltage
General Description
The turbocharger boost sensor senses turbocharger boost pressure (vacuum) and converts it into electrical signals. The turbocharger boost sensor outputs low signal voltage at high-vacuum (throttle valve closed) and high signal voltage at low-vacuum (throttle valve wide open). If the signal voltage from the turbocharger boost sensor is a set value, the powertrain control module (PCM) detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 2 seconds or more |
| DTC Type | One drive cycle, MIL on |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
DTC: P0237
The turbocharger boost sensor output voltage [TC Boost Pressure Sensor] is 0.23 V or less for at least 2 seconds.
DTC: P0238
The turbocharger boost sensor output voltage [TC Boost Pressure Sensor] is 4.49 V or more for at least 2 seconds.
[ ]: HDS Parameter
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
DTC: P0237
- Turbocharger boost sensor P3 line short to ground
- Turbocharger boost sensor VCC2 line open
DTC: P0238
- Turbocharger boost sensor P3 line open
- Turbocharger boost sensor SG2 line open
Common
- Turbocharger boost sensor failure
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot are stored in the PCM memory.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.