P0236 — Turbocharger/Supercharger Boost Sensor A Circuit Range/Performance — 6.0 Power Stroke

Diagnostic reference for 6.0 Power Stroke (2003.5–2007) P0236.

Updated October 15, 2026

What it means

Generic definition: The boost (MAP) sensor A signal is outside the range or rate the PCM expects for current conditions. On the 6.0L this code is associated with the MAP sensor and its sensing hose/port, and with boost-related conditions.¹

Most likely causes

1. Soot-plugged MAP sensor sensing hose or port — On the 6.0L the MAP sensing hose/port can plug with soot, causing P0236 and related MAP correlation faults. Check the MAP sensor and its sensing hose or port for soot plugging or a split before replacing the turbo.¹¹
2. Boost leak in intake tract — A leak between the turbo outlet and the intake manifold can cause the MAP signal to be out of expected range for operating conditions. Typical on this platform: check for boost leaks before replacing the turbo.¹
3. MAP sensor performance drift or failure — The MAP sensor may read out of range or respond slowly, triggering a range/performance fault. Typical on this platform: check the MAP sensor and its sensing hose or port for soot plugging or a split, and for boost leaks, before replacing the turbo.¹
4. VGT control upset by erroneous EBP input — Bad EBP readings can upset VGT control and indirectly affect boost. On the 6.0L P0471 is very often a soot-clogged EBP sensor tube or a sensor that reads wrong at key-on (EBP should match barometric pressure engine-off); bad EBP readings also upset VGT control.²
5. VGT vane/soot sticking leading to abnormal boost — Soot-stuck vanes/unison ring can produce underboost/overboost conditions that move the MAP signal outside expected range. Typical on this platform: On the 6.0L check the MAP sensor and its sensing hose or port for soot plugging or a split, and for boost leaks, before replacing the turbo.¹

How to diagnose

1. Verify code and freeze frame; confirm P0236 is present and note engine load/RPM at set.
2. Key-on engine-off: compare MAP, BARO and EBP readings. On the 6.0L P0069 is usually a soot-plugged MAP sensor port or hose, or a failing MAP sensor; compare MAP, BARO and EBP readings key-on engine-off.
3. Inspect MAP sensor and sensing hose/port for soot plugging, oil contamination, or a split.
4. Inspect intake tract for boost leaks: intercooler boots, clamps, CAC pipes.
5. Check EBP sensor tube for soot clogging and verify EBP matches barometric pressure key-on engine-off.
6. Monitor live MAP vs. commanded boost under steady load; look for slow response or values outside expected range.
7. If MAP reads plausible but boost is low/high, evaluate VGT operation (vane sticking/soot) as a contributor to abnormal boost.

Common mistake to avoid

Replacing the turbo before smoke-testing the intake. Boost leaks at intercooler boots, end tanks and clamps are a common cause of low power and underboost codes, and they mimic a failing turbo. Source: BD Diesel — 6.7L Power Stroke problems and real fixes.

Parts and tools you may need

• Digital multimeter
• Scan tool with live data (MAP, BARO, EBP, VGT duty)
• Hand vacuum/pressure pump
• Inspection mirror and flashlight
• Cleaning solvent safe for sensors
• Basic hand tools for sensor removal

Tools you’ll need

• OBD-II scan tool — Read P0236 freeze frame and compare live MAP, BARO, and EBP key-on engine-off to spot out-of-range or slow MAP response.
• Digital multimeter — Verify MAP sensor supply, ground, and signal voltages against spec to detect drift or failure causing out-of-range signal.
• Borescope — Inspect MAP sensor port and EBP sensor tube for internal soot plugging without disassembly.

Rough cost and difficulty

Typical US independent-shop figures; labor runs about $120–$180 per hour (dealers charge more). Confirm the diagnosis before buying parts.

When to see a pro

If diagnosis points to internal turbo/VGT mechanical issues, high-pressure oil system faults, or requires removal of major components, have a qualified diesel technician perform the work. Stop diagnosis if safety-critical systems are involved.

Check for recalls

Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.

Sources