DTC 211 — Engine Oil Pressure Signal Out of Range – Low — International DT466E

Navistar three-digit code for the International DT466E (1996–2003). The ECM sees the engine oil pressure (EOP) sensor signal voltage below its valid range.…

Updated October 15, 2026

What it means

On the DT466E, DTC 211 means the engine oil pressure (EOP) sensor signal voltage is below its valid range. Typical on this platform is an open 5 V reference, an open signal circuit, or a failed EOP sensor; a sensor-circuit fault, not necessarily real low oil pressure.¹

Most likely causes

1. Open 5 V reference to the EOP sensor or shared reference circuit interruption — An open reference supply pulls the EOP signal low and triggers the low-range fault.¹
2. Open signal wire between the EOP sensor and ECM — A broken or corroded signal circuit reads as low voltage at the ECM.¹
3. Failed EOP sensor (internal open or out-of-range output) — A failed sensor can output a voltage below the valid range even with normal oil pressure.¹

How to diagnose

1. Verify the code with a scan tool and confirm DTC 211 is active; note freeze-frame conditions.
2. Inspect EOP sensor connector for corrosion, moisture, bent pins, and secure lock; repair as needed.
3. Check EOP sensor 5 V reference voltage at the sensor connector with key on, engine off; compare to spec and confirm reference is present.
4. Measure EOP signal voltage at the sensor connector with key on, engine off; compare to expected idle voltage range for the sensor.
5. Back-probe the EOP signal wire at the ECM connector and compare voltage to sensor side to detect an open or high resistance in the harness.
6. Perform a continuity and resistance check of the EOP signal and reference circuits from sensor to ECM; repair any opens or shorts.
7. If circuits test good, substitute a known-good EOP sensor and recheck signal voltage and code status.
8. If the code persists with good circuits and a good sensor, inspect ECM connector and pins for corrosion or damage.
9. Clear codes, run the engine through normal operating temperature and load, and confirm DTC 211 does not return.
10. If actual low oil pressure is suspected, verify with a mechanical gauge before condemning the sensor circuit; DTC 313/314 indicate real low pressure conditions.

Parts and tools you may need

• Digital multimeter
• Navistar-compatible scan tool
• Mechanical oil pressure gauge
• Wiring diagram for DT466E EOP circuit
• Contact cleaner and dielectric grease
• Replacement EOP sensor

Tools you’ll need

• digital multimeter — Measures 5 V reference and EOP signal voltage at the sensor and ECM to detect opens or out-of-range signals causing DTC 211.
• OBD-II scan tool — Reads and clears DTC 211 and captures freeze-frame data to confirm the fault is active and monitor status after repairs.
• wiring repair kit — Repairs corroded or damaged EOP sensor connector pins and harness opens in the 5 V reference and signal circuits.
• mechanical oil pressure gauge — Verifies actual engine oil pressure independently to rule out real low pressure versus a sensor-circuit fault.

Rough cost and difficulty

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 EOP circuit tests good but the code returns, or if a mechanical gauge shows low oil pressure, have the engine inspected by a qualified diesel technician. Do not operate the engine with confirmed low oil pressure.

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