Can you keep driving?
Can you keep driving?
Stop driving if any of these apply
- !The engine starts stalling, losing power sharply, or refusing to respond to throttle normally.
- !The check-engine light flashes or the vehicle suddenly runs much worse after the code appears.
What to check first
Step-by-step checks
- 1
Free - no tools
Inspect the boost sensor connector, harness, and hose for damage or disconnection
- 2
Free - no tools
Check whether the code appeared after boost-pipe work or turbo service
- 3
Basic tool needed
Compare boost reading at key-on, idle, and under light load if scan data is available
- 4
Basic tool needed
If the car feels down on power or the turbo does not spool normally, treat that as an important clue
- 5
Basic tool needed
If other boost or intake codes are present, diagnose them together
If the code returns
- -If the reading is unrealistically low, circuit or hose fault becomes more likely than turbo wear alone.
- -If the hose is cracked or off, fix that before replacing the sensor.
- -If the code returns after replacement, verify the reference and signal path again.
Background
What this code means
P0237 is a generic OBD-II code for a low-input turbocharger boost sensor A fault.
The ECU is seeing a pressure reading lower than expected, which can happen because of a shorted sensor, a disconnected hose, or a circuit issue.
Diagnosis
Common causes
Shorted boost sensor circuit
A short can pull the sensor reading too low.
Disconnected or leaking hose
A bad reference line can make the sensor report low pressure.
Failed boost sensor
The sensor may be stuck reading below reality.
Harness damage
A damaged wire near hot or moving parts can create the same result.
Avoid these mistakes
What not to do
- xDo not replace the sensor or pump first if there is obvious wiring, connector, or intake damage.
- xDo not ignore drivability changes or stalling just because the code sounds electrical.
Parts
Parts that may need replacing
See also
Related OBD codes
P0234
P0234 usually means the turbo or supercharger is producing too much boost.
P0235
P0235 usually means boost sensor A has a circuit malfunction.
P0236
P0236 usually means boost sensor A is out of range or performing poorly.
P0238
P0238 usually means boost sensor A is reading too high.
P0239
P0239 usually means boost sensor B is out of range or performing poorly.
Source notes
Generic OBD-II (SAE J1979 / ISO 15031-5). P0237 was expanded around common low-input boost-sensor faults, including shorts, hose leaks, and wiring damage.
This guide is written as a generic multi-make reference, so bulletin history, sensor locations, and repair order can still change by manufacturer and engine family.
This is generic OBD-II guidance and should not override vehicle-specific service information. Exact diagnosis and repair steps vary by make, engine family, and model year.
Last reviewed: 2026-04-10
Reference: Open reference