P0237 Low level sensor A boost turbocharger / supercharger

OBD-II Trouble Code - P0237 - Data Sheet

Generic: Turbocharger / Supercharger Boost Sensor A Circuit Low Power GM: Turbocharger Boost Circuit Low Input Dodge Chrysler: MAP Sensor Signal Too Low

What does trouble code P0237 mean?

This is a Generic Transmission Diagnostic Trouble Code (DTC) applicable to all turbocharged vehicles. Car brands may include but are not limited to VW, Dodge, Mercedes, Isuzu, Chrysler, Jeep, etc.

The powertrain control module (PCM) monitors boost pressure using a sensor called a manifold absolute pressure (MAP) sensor. Understanding how the MAP sensor works is the first step to explaining the cause of the P0237.

The PCM sends a 5V reference signal to the MAP sensor and the MAP sensor sends an AC voltage signal back to the PCM. When the boost pressure is high, the voltage signal is high. When the boost pressure is low, the voltage is low. The PCM uses a boost control solenoid to control the amount of boost pressure generated by the turbocharger while verifying the correct boost pressure using the boost pressure sensor.

This code is set when the PCM detects a low voltage signal indicating low boost pressure when a high pressure command has been sent to boost control solenoid "A".

Symptoms

Symptoms of a P0237 code may include:

• The engine light comes on.
• Low engine power
• Reduced fuel economy

Since the presence of a P0237 increases the likelihood of damage to the catalytic converter and increased turbocharging, it should be corrected before continuing to use the vehicle.

Causes of the P0237 code

Possible reasons for setting this code:

• Boost sensor "A" is faulty
• Defective turbocharger
• Defective PCM
• Wiring problem

Diagnostic and repair procedures

Before diagnosing P0237, make sure there are no other trouble codes in the PCM memory. If other DTCs are present, they should be checked first. Any codes related to bypass valve control or 5V reference will create the conditions necessary to set this code. In my experience, PCM is the least likely cause of this problem. Most often, these are frayed or burned wires near the turbocharger, causing a short circuit or open circuit.

A good starting point is always to check the Technical Service Bulletins (TSB) for your particular vehicle. Your problem may be a known issue with a known manufacturer-released fix and could save you time and money while troubleshooting.

• A thorough visual inspection is critical when trying to resolve this particular DTC. I saw that faulty connections or faulty wiring were the root of the problem more than anything else. Disconnect the boost sensor "A" and boost control solenoid "A" connectors and carefully inspect the terminals (metal parts inside the plastic plug) for spillage. When assembling, use silicone dielectric compound on all connections.
• Ignition ON with the engine OFF (KOEO), check the boost sensor reference wire at the sensor connector with a digital volt ohm meter (DVOM), check for 5 volts. If the voltage is normal, the reverse sensor, the boost sensor signal wire should be in the range of 2 to 5 volts. If everything is in order, continue to the next step if you do not suspect that the boost sensor is faulty.
• Leave the DVOM connected, start the engine and use the hand vacuum pump to apply vacuum to the turbocharger wastegate vacuum motor. The voltage should increase if it suspects a faulty PCM, if not, suspects a faulty turbocharger.

COMMON ERRORS WHEN DIAGNOSING CODE P0237

Follow these simple guidelines to avoid misdiagnosis:

• Try unplugging the sensor to see if the short and code goes away.
• Check the wiring harness for melting due to loose or dangling wiring harnesses.

HOW SERIOUS CODE P0237 IS?

A short in the sensor circuit will cause the ECM to disable Turbo Boost until the problem is corrected and the code is cleared.

• P0237 BRAND SPECIFIC INFORMATION

• P0237 CHRYSLER MAP sensor too high
• P0237 DODGE MAP Sensor Too High Too Long
• P0237 ISUZU Turbocharger Boost Sensor Circuit Low Voltage
• P0237 Jeep MAP sensor too high
• P0237 MERCEDES-BENZ Turbocharger/Supercharger Boost Sensor "A" Circuit Low
• P0237 NISSAN Turbocharger Boost Sensor Circuit Low
• P0237 VOLKSWAGEN Turbo / Super Charger Boost Sensor ‘A’ Circuit Low

P0237 ✅ SYMPTOMS AND CORRECT SOLUTION ✅ - OBD2 Fault Code

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