DTC P0235: Turbocharger Boost Sensor “A” Circuit Malfunction

In the intricate realm of automotive diagnostics, diagnostic trouble codes (DTCs) act as critical guides, revealing potential issues within a vehicle’s systems. DTC P0235 takes center stage as a significant signal of problems related to the Turbocharger Boost Sensor “A” Circuit Malfunction. This comprehensive article delves into the causes, symptoms, inspection procedures, and effective solutions for diagnosing and resolving DTC P0235.

1. Causes of DTC P0235:

DTC P0235 emerges when the Engine Control Module (ECM) detects a malfunction in the Turbocharger Boost Sensor “A” circuit. The underlying causes can encompass:

– Faulty turbocharger boost sensor: A malfunctioning sensor can provide inaccurate boost pressure readings.

– Wiring and connector issues: Damaged or corroded wiring and connectors within the circuit can disrupt sensor signal transmission.

– Turbocharger issues: Malfunctions within the turbocharger can affect sensor accuracy.

– ECM malfunction: An erratic ECM can misinterpret sensor data, triggering DTC P0235.

2. Symptoms of DTC P0235:

Recognizing the symptoms associated with DTC P0235 aids mechanics in accurate diagnosis:

– Check Engine Light (CEL) illumination: DTC P0235 triggers the CEL to alert the driver of a turbocharger boost sensor circuit malfunction.

– Reduced engine power: The ECM may reduce engine power to prevent potential issues due to inaccurate boost pressure readings.

– Poor acceleration: The vehicle may exhibit sluggish acceleration due to improper boost pressure regulation.

3. Inspection of DTC P0235:

Thorough inspection techniques are pivotal for pinpointing the root cause:

– OBD-II scan: Utilize an OBD-II scanner to retrieve the DTC and freeze frame data, providing insight into the conditions that activated the code.

– Visual examination: Inspect the turbocharger boost sensor, wiring, and connectors for visible damage, corrosion, or loose connections.

4. Resolving Causes of DTC P0235:

Addressing DTC P0235 involves specific actions tailored to the underlying issue:

– Turbocharger boost sensor replacement: Replace the faulty sensor with a new unit adhering to manufacturer specifications.

– Wiring and connector repair: Repair or replace damaged wiring and connectors to ensure accurate sensor signal transmission.

– Turbocharger inspection and repair: Ensure the turbocharger is functioning correctly.

– ECM diagnosis: If an ECM malfunction is suspected, diagnose and address the issue through reprogramming or replacement.

5. Clearing DTC P0235:

After effectively resolving the root cause, clear the DTC from the ECM’s memory using an OBD-II scanner. This step confirms the issue’s resolution and prevents the CEL from reappearing.


DTC P0235, indicating Turbocharger Boost Sensor “A” Circuit Malfunction, highlights the significance of accurate sensor readings for optimal engine performance. By understanding its causes, recognizing its symptoms, employing meticulous inspection techniques, and implementing effective solutions, mechanics can accurately diagnose and rectify this issue. Ensuring reliable turbocharger boost sensor data contributes to improved engine efficiency, performance, and overall vehicle operation.