DTC Advanced Diagnostics: P0237, P0238
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
NOTE: 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 VCC line open

DTC: P0238
Turbocharger boost sensor P3 line open
Turbocharger boost sensor SG 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, and the freeze data 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, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.