DTC 144 — CMP Signal Noise Detected — International DT466E
The ECM detected electrical noise on the camshaft position (CMP) signal. On the International DT466E (1996–2003) this is a Navistar three-digit flash code…
What it means
The ECM detected electrical noise on the camshaft position (CMP) signal. On the International DT466E (1996–2003) this is a Navistar three-digit flash code affecting the camshaft position sensor. Typical causes are damaged or poorly routed CMP wiring, a bad ground, or a failing sensor.1
Most likely causes
- Damaged or poorly routed CMP wiring causing electrical noise — Inspect the CMP harness for chafing, pinching, or routing near high-current or ignition sources that can induce noise on the signal circuit.1
- Bad ground or poor electrical connection at the CMP sensor or ECM — Check the CMP sensor ground and ECM ground points for corrosion, looseness, or high resistance that can introduce noise into the CMP signal.1
- Failing CMP sensor producing erratic output — A degraded CMP sensor can generate an unstable signal that the ECM interprets as noise; verify sensor condition and air gap per platform practice.12
How to diagnose
- Verify the code with a scan tool or flash code read and confirm the engine is a DT466E (1996–2003) with a camshaft position sensor; CMP faults on this platform can cause no-start or stalling.
- Inspect CMP wiring routing and physical condition for chafing, pinching, or proximity to high-current wiring; repair or reroute as needed.
- Check CMP sensor connector for corrosion, oil intrusion, and terminal tension; clean and secure connections.
- Verify sensor and ECM grounds for corrosion and tightness; repair grounds to eliminate noise paths.
- Monitor CMP signal with a lab scope during cranking/running to look for erratic or noisy waveform; compare to expected pattern.
- If wiring and grounds are good, test/replace the CMP sensor; a failing sensor is a typical source of signal noise on this platform.
Parts and tools you may need
- Digital multimeter
- Lab scope or oscilloscope
- Navistar-compatible scan tool for flash codes
- Basic hand tools for harness and sensor access
Tools you’ll need
- OBD-II scan tool — Reads and clears DTC 144 and monitors live CMP data to confirm the noise fault on the DT466E.
- digital multimeter — Checks CMP sensor supply voltage, ground integrity, and wiring continuity to find noise paths and bad connections.
- lab scope — Captures the CMP waveform during cranking/running to identify erratic or noisy signal patterns.
- inspection mirror and flashlight — Allows visual inspection of CMP wiring routing, chafing, and proximity to high-current wiring in tight engine areas.
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 |
| Crankshaft or camshaft position sensor | $40–$200 | 0.5–2 hrs | DIY with tools and a manual |
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 engine cranks with no start, stalls intermittently, or the CMP signal remains noisy after wiring/ground repairs, have a qualified diesel technician evaluate the sensor and ECM circuits. Do not attempt high-pressure oil system service for this code.
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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