What Codes Will This Page Cover?
We will discuss the following codes on this page:
- P0237 – Turbocharger/Supercharger Boost Sensor “A” Circuit Low
- P0238 – Turbocharger/Supercharger Boost Sensor “A” Circuit High
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What Is the P0237 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
Difficulty of Inspecting
Get Additional Help
P0237 is an OBD-II generic code that is set when the powertrain control module (PCM) detects that the intake boost pressure sensor voltage falls below specifications. This may be due to a short in the wiring.
The Boost Pressure Sensor tells the PCM how much boost is coming from the turbocharger/supercharger. If the PCM detects a higher-than-normal signal from the Boost Pressure Sensor, then the PCM will then set code P0238.
More about P0237 and P0238 codes
OBD II fault code P0237 indicates a “Manifold Absolute Pressure (MAP) sensor “A,” turbocharger (TC) system low input” as set by the PCM when it detects substandard low readings from the turbocharger boost pressure sensor.
The TCBS is a pressure-sensitive sensor that changes resistance based on boost pressure changes. This sensor receives a 5-volt reference voltage from the PCM, so any boost pressure change detected by the sensor is transmitted back to the PCM via a dedicated signal circuit.
The PCM translates the signal voltage as pressure, so if the voltage falls below a minimum value, the PCM interprets this as insufficient control of the boost pressure and sets code P0237 along with a check engine light.
P0238 indicates an open or high voltage condition in the circuit.
What Are the Symptoms of a P0237 Code?
Symptoms include an illuminated Check Engine Light, unresponsive turbo boost during acceleration, and an underpowered engine. You might also hear noises coming from the turbocharger, like hissing, whistling, or “wheezing” during higher speeds.
What Are Some Causes of a P0237 Code?
Some of the common causes of P0237 or P0238 errors may be due to a shorted turbo boost pressure sensor, a loose or faulty turbo boost pressure sensor A connector, frayed or grounded wiring, or a failing PCM.
How Serious Is the P0237 Code?
The PCM will disable the turbo boost until the problem is fixed. Serious and potentially catastrophic damage can occur to both the engine and turbocharger if the issue is ignored.
Can I Still Drive with a P0237 Code?
A code P0237/P0238 that is present in a vehicle should not be driven, particularly in traffic, because of serious and unpredictable driveability concerns. The vehicle can stall or misfire suddenly, risking the safety of the occupants and other vehicles on the road.
How Easy Is It to Diagnose a P0237 Code?
An ODB II scanner is needed to diagnose a P0237 or P0238 code. Perform visual checks on the affected areas to rule out external damage. The scanner also documents the freeze frame data to validate the problem.
Once codes are recorded, visual inspections are done, and the codes are cleared, a test drive should be performed to see if the codes will return. This also checks the boost pressure sensor signal and correlates it with the MAP sensor.
How Difficult Is It to Inspect a P0237 Code?
To properly diagnose a P0237 or P0238 code, you’ll need to inspect the affected areas and know the components unique to your vehicle’s make and model. You need to have a significant amount of knowledge about the diagnosis and repair of these codes because the safety of the vehicle is at stake.
Need Additional Help with Your P0237 Code?
The turbo boost on vehicles with code P0237 or P0238 will be disabled by the PCM. These error codes can cause lack of power on acceleration and will require immediate repair from a qualified mechanic to prevent further damage to the engine. Even if you’re considering fixing this code on your own, it’s always a good idea to find a good repair shop just in case the task becomes too daunting.
Use Kelley Blue Book to find a repair shop in your area. This makes fixing your car easier and more convenient, no matter what the problem may be.
If you are a DIY mechanic who wants to learn more about error codes and how to fix them, then the KBB OBD-II database provides detailed information that could help you better understand your car.
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