What does P0237 Generic: Turbocharger/Supercharger Boost Sensor 'A' Circuit Low GM: Turbocharger Boost Circuit Low Input Conditions Dodge Chrysler: MAP Sensor Signal Too Low mean?
The P0237 OBD code stands for Turbocharger/Supercharger Boost Sensor 'A' Circuit Low.
This code is applicable to all turbocharged vehicles, including brands like VW, Dodge, Mercedes, Isuzu, Chrysler, and Jeep.
The powertrain control module (PCM) monitors boost pressure with a sensor called the manifold absolute pressure sensor (MAP).
The PCM sends a 5-volt reference signal to the MAP sensor, which then sends a variable voltage signal back to the PCM.
When boost pressure is high, the voltage signal is high, and when it is low, the voltage is low.
The PCM uses the boost control solenoid to control the amount of boost pressure produced by the turbocharger and verifies this pressure with the boost pressure sensor.
The P0237 code is set when the PCM senses a low voltage signal indicating low boost pressure when a high pressure command has been sent to the boost control solenoid 'A'.
Symptoms of this code include a check engine light, low engine power, and reduced fuel economy.
It is important to correct this issue to avoid potential damage to the catalytic converter and turbocharger.
Potential causes for this code include a faulty boost sensor 'A', faulty turbocharger, faulty PCM, or a wiring problem.
When diagnosing this code, it is important to check for any other trouble codes present in the PCM memory, as well as inspecting the wiring near the turbocharger for chafing or burnt areas that could cause shorts or opens in the circuit.
Checking for technical service bulletins (TSB) specific to your vehicle can also provide valuable information.
A thorough visual inspection, as well as voltage testing with a digital voltmeter, can help identify any faulty components.
P0237 Symptoms
- Check engine light will be on
- Low engine power
- Reduced fuel economy
Possible P0237 Causes
- Faulty boost sensor u0027Au0027
- Faulty turbocharger
- Faulty PCM
- Wiring problem
Troubleshooting P0237 error code
- Check for other trouble codes present in the PCM memory
- Inspect for chafed or burnt wiring near the turbocharger
- Check technical service bulletins (TSB) for your particular vehicle
- Thorough visual inspection of connections and wiring
- Check voltage of boost sensor reference wire
- Check voltage of boost sensor signal wire
- Apply vacuum to turbocharger waste gate vacuum motor and check voltage
- Refer to vehicle-specific discussion forums for additional support
