DTC 151 — Barometric Pressure Signal Out of Range – High — International DT466E
Barometric pressure signal out of range high on International DT466E (1996–2003).
What it means
Navistar DTC 151 means the barometric pressure (BAP) sensor signal is above its valid range on the International DT466E. Typical on this platform is a failed BAP sensor or circuit fault.1
Most likely causes
- Failed barometric pressure sensor — The BAP sensor is reading out of range high.1
- BAP signal circuit shorted to voltage — The BAP signal wire is shorted to a higher voltage source.1
- BAP reference or ground circuit fault — A fault in the 5 V reference or ground for the BAP sensor causes an out-of-range high reading.1
How to diagnose
- Verify the DTC with a scan tool or flash codes; confirm DTC 151 is present and active.
- Inspect the BAP sensor connector for corrosion, moisture, or loose terminals.
- Check the BAP sensor wiring for chafing, pinching, or shorts to voltage; inspect routing near hot or moving parts.
- Measure BAP sensor supply (reference) voltage and ground integrity at the sensor connector with key on, engine off.
- Compare BAP sensor signal voltage to expected barometric pressure for altitude; an abnormally high voltage indicates a sensor or circuit fault.
- If wiring and power/ground are good, replace the BAP sensor and retest for DTC 151.
Parts and tools you may need
- Digital multimeter
- Scan tool capable of Navistar three-digit codes
- Basic hand tools
- Replacement barometric pressure sensor
- Dielectric grease
- Contact cleaner
Tools you’ll need
- OBD-II scan tool — Read and confirm active DTC 151 on the DT466E ECM and monitor BAP sensor live data.
- Digital multimeter — Measure BAP sensor reference voltage, ground integrity, and signal voltage to detect shorts to voltage or out-of-range readings.
- Terminal test kit — Inspect and verify BAP sensor connector terminals for corrosion, looseness, and proper pin tension.
- Inspection mirror and flashlight — Visually check BAP sensor wiring routing for chafing, pinching, or exposure to heat and moving parts.
Rough cost and difficulty
| Likely repair | Parts | Shop labor | Who usually does it |
|---|---|---|---|
| Wiring or connector repair | $10–$100 | 1–4 hrs | DIY with tools and a manual |
| Temperature or pressure sensor (coolant, intake air, oil, fuel temp) | $30–$150 | 0.3–1.5 hrs | Easy DIY |
Typical US independent-shop figures; labor runs about $140–$200 per hour (dealers charge more). Confirm the diagnosis before buying parts.
When to see a pro
If the code returns after sensor and wiring checks, have a qualified diesel technician evaluate the ECM inputs and harness integrity. Do not attempt repairs on high-pressure oil systems without proper training.
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
Spotted an error, or something missing? Tell us
Run a International DT466E? This goes straight to the editor — it is not published.