Diesel Trouble Codes

P2262 — Turbocharger/Supercharger Boost Pressure Not Detected - Mechanical — 5.9 Cummins Common Rail

Diagnostic reference for 5.9 Cummins Common Rail 2003-2007 Dodge Ram 2500/3500 ISB. Code P2262 indicates the ECM expected boost but did not detect it. On this…

Updated October 15, 2026

What it means

Generic definition: ECM expected to see boost but did not. On the 5.9L common rail with wastegated HY35W/HE351CW turbo, this is a mechanical boost detection issue, not a VGT control fault.1

Most likely causes

  1. Boost leak in intake tract (intercooler pipes, boots, clamps) causing measured boost to be lost before the MAP sensor — Pressure escapes from intercooler piping or loose boots so the MAP sensor reads low or no boost under load.1
  2. Wastegate stuck open or wastegate actuator linkage/rod fault causing boost to bleed off — Wastegate held open prevents the turbo from building expected manifold pressure.1
  3. MAP sensor or MAP sensor hose/connector fault giving no valid boost signal to ECM — Clogged, cracked, or disconnected MAP hose, or a failed MAP sensor, results in no boost reading even if boost is present.1
  4. Turbocharger mechanical failure (excessive shaft play, damaged compressor wheel, seized turbine) preventing boost generation — Turbo cannot produce boost due to mechanical wear or damage.12
  5. Severely restricted intake (clogged air filter) limiting airflow and boost production — High intake restriction reduces mass flow, leading to low or no boost under load.1

How to diagnose

  1. Verify code and freeze frame; confirm P2262 is present with no accompanying MAP circuit codes.
  2. Inspect intake system for boost leaks: check intercooler pipes, boots, clamps, and CAC for oil, cracks, or loose connections.
  3. Inspect wastegate operation: check wastegate actuator rod movement and verify wastegate is not stuck open; inspect for carbon binding on the wastegate valve.
  4. Inspect MAP sensor and hose: check MAP sensor connector and wiring for damage, verify MAP hose is intact and not clogged with oil/debris, and confirm sensor is properly seated.
  5. Perform a visual and mechanical turbo inspection: check for excessive shaft play, damaged compressor wheel, oil in intake, and turbine housing restriction.
  6. Check intake restriction: inspect air filter condition and intake piping for blockage.

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

Tools you’ll need

Rough cost and difficulty

Likely repairPartsShop laborWho usually does it
MAP/boost pressure sensor$40–$2000.3–1 hrsEasy DIY
Intercooler boot, clamp or pipe repair$20–$2000.5–2 hrsEasy DIY
Wastegate actuator or control solenoid$50–$3000.5–2 hrsDIY with tools and a manual
Turbocharger$700–$1,6002–4 hrsShop

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 turbocharger mechanical failure is suspected or confirmed, have a qualified diesel technician inspect and replace the turbocharger assembly. Do not attempt high-pressure fuel system service. If diagnosis is inconclusive, professional scan tool data review and boost pressure testing is recommended.

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

  1. Curated DTC seed — 5.9 Cummins Common Rail (curated) ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

  2. NHTSA owner report 10239733 ↩︎