P0236
Turbocharger/Supercharger Boost Sensor A Circuit Range/Performance
The engine computer is getting a boost-pressure reading that does not match what the engine and turbo system should be doing. The sensor may be bad, the wiring may be faulty, or the engine may really have a boost-control problem that makes the reading implausible.
- SEV
- 3/5
- DRIVE
- CAUTION
- DIY
- $20-$250
- SHOP
- $120-$700
Quick answer
AI-CITATION READYWhat it means
Can you drive with it?
Most common causes
- Faulty boost pressure sensor or MAP sensor used for boost measurement
- Damaged, loose, or corroded boost-sensor wiring or connector
- Boost hose, intake, or charge-air system problem causing implausible pressure behavior
Typical repair cost
DIY usually runs $20-$250. Typical shop repair lands around $120-$700, depending on the root cause.
01 / Definition
P0236 sets when the PCM sees the boost pressure sensor A signal outside the expected range or not behaving correctly for current engine load, throttle, and RPM. The signal may be inaccurate, slow to respond, or inconsistent with commanded boost. The fault can be caused by a bad boost sensor, wiring problem, contamination in the sensor passage, or a real overboost or underboost condition that makes the reading implausible.
02 / Drive status
With caution. You may be able to drive short distances, but the vehicle may lose power, surge, enter limp mode, or run with incorrect boost control. Avoid heavy throttle until it is diagnosed.
03 / Symptoms
- Check engine light
- Reduced engine power
- Limp mode
- Poor acceleration
- Surging under boost
- Possible companion overboost or underboost codes
04 / Causes
| 1 | Faulty boost pressure sensor or MAP sensor used for boost measurement | high |
|---|---|---|
| 2 | Damaged, loose, or corroded boost-sensor wiring or connector | high |
| 3 | Boost hose, intake, or charge-air system problem causing implausible pressure behavior | high |
| 4 | Wastegate, boost control solenoid, or turbo control fault causing real boost mismatch | medium |
| 5 | Blocked, contaminated, or oil-fouled sensor port or pressure passage | medium |
| 6 | PCM software or input-circuit problem | low |
05 / Diagnostic sequence
- 01Check for related turbo, MAP, MAF, overboost, or underboost codes.
- 02Inspect the boost pressure sensor connector and wiring for corrosion, heat damage, oil contamination, or loose pins.
- 03Compare boost sensor readings with key on, engine off, at idle, and under load to make sure the values change in a plausible way.
- 04Inspect the sensor port or pressure passage for blockage, oil contamination, or moisture.
- 05Check charge pipes, intercooler hoses, and clamps for leaks, restriction, or disconnection.
- 06Compare commanded boost to actual boost during a controlled road test.
- 07Inspect wastegate control, boost control solenoid operation, and related vacuum or pressure hoses if the sensor circuit tests good.
- 08Replace the sensor only after verifying the signal, reference voltage, ground, and mechanical boost system condition.
06 / Repairs
| 1 | Repair boost pressure sensor wiring, connector pins, or reference-voltage and ground faults | $20-$200 |
|---|---|---|
| 2 | Clean a contaminated sensor port or repair damaged pressure passages and hoses | $0-$120 |
| 3 | Repair boost leaks, charge-air piping faults, or intake restrictions affecting sensor plausibility | $20-$600 |
| 4 | Replace the boost pressure sensor after testing confirms inaccurate readings | $50-$250 |
| 5 | Repair wastegate, boost control solenoid, or related control faults if real boost is out of range | $80-$700 |
| 6 | Update PCM software or diagnose PCM input-circuit faults if the external system checks good | $100-$800 |
07 / Related codes
08 / FAQ
Is P0236 a sensor code or a turbo code?
It can be either. The code is set when the boost sensor reading is implausible, and that can come from the sensor, wiring, or a real boost-control problem.
Can P0236 happen with a boost leak?
Yes. A leak or restriction in the charge-air system can make boost readings behave outside the expected range.
Should I replace the boost sensor first?
Not before checking wiring, sensor supply voltage, connector condition, and the mechanical boost system.
Can P0236 appear with P0234 or P0299?
Yes. A real overboost or underboost condition can make the boost sensor reading fail the PCM plausibility check.
09 / Source and method
- DATA BASIS
- OBD-II REFERENCE + OBD2.HELP
- METHOD
- STATIC VALIDATION
- SAFETY
- INFORMATIONAL
This page combines OBD-II diagnostic reference data with OBD2.help generated diagnostic guidance for code meaning, likely causes, and repair direction.
Publishing uses deterministic schema and build validation, plus manual spot checks on representative pages before release.
Safety-critical diagnosis and repairs should be confirmed with a qualified mechanic, especially when the vehicle is misfiring, overheating, or losing power.