DTC 212 — Engine Oil Pressure Signal Out of Range – High — International DT466E
DTC 212 on International DT466E (1996–2003) indicates the engine oil pressure sensor signal voltage is above its valid range. This is a sensor-circuit fault…
What it means
On the DT466E, DTC 212 means the ECM is seeing an Engine Oil Pressure (EOP) sensor signal voltage above the valid range. The code is a Navistar three-digit flash code for the engine oil pressure sensor circuit. Typical on this platform is a failed EOP sensor or a signal circuit shorted to voltage.1
Most likely causes
- Failed engine oil pressure sensor internally shorted high — The EOP sensor can fail internally and pull the signal voltage above the ECM’s valid range, setting DTC 212.1
- EOP signal wire shorted to a voltage source — Chafed or pinched wiring can short the EOP signal circuit to a higher-voltage feed, causing the ECM to read an out-of-range high voltage.1
- Corrosion or poor ground affecting sensor reference — A poor sensor ground or reference can skew the EOP signal high enough for the ECM to flag out-of-range high.1
How to diagnose
- Verify the code with a scan tool or flash code count; confirm DTC 212 is active and note freeze-frame conditions.
- Inspect the EOP sensor connector for corrosion, moisture, bent pins, and secure seating; repair as needed.
- Visually inspect the EOP sensor signal wiring and harness for chafing, heat damage, or shorts to power; repair any damage.
- With key on, engine off, measure EOP sensor reference and signal voltages at the sensor connector and compare to the DT466E spec; an abnormally high signal voltage points to a shorted sensor or wiring.
- Disconnect the EOP sensor and recheck the signal voltage at the ECM harness side; if the voltage remains high, the wiring is shorted to voltage. If voltage returns to normal, the sensor is suspect.
- If wiring tests normal, replace the EOP sensor with a correct Navistar part and clear codes; retest to confirm DTC 212 does not return.
Parts and tools you may need
- Digital multimeter
- Navistar-compatible scan tool or flash code reader
- EOP sensor socket
- Dielectric grease
- Wiring repair kit
Tools you’ll need
- digital multimeter — Measures EOP sensor reference and signal voltages at the sensor connector and ECM harness side to detect a high signal or a short to voltage.
- OBD-II scan tool — Reads and confirms active DTC 212 and freeze-frame data to verify the fault before and after repairs.
- inspection mirror — Allows visual inspection of the EOP sensor connector and wiring in tight engine bays for corrosion, moisture, or chafing.
- wire piercing probes — Enables safe voltage checks on the EOP signal wire without disconnecting the harness during key-on tests.
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 signal wire is shorted inside the main harness, or if DTC 212 returns after sensor and connector repairs, have a qualified diesel technician perform pin-to-pin continuity and ECM input tests to avoid misdiagnosis.
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
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