Diesel Trouble Codes

Hard Start or No Start — International DT466E

DT466E hard start or no start guide for International DT466E (1996–2003).

Updated October 15, 2026

What’s going on

On the DT466E, hard start or no start usually means the HEUI system cannot build enough injection control pressure during cranking, or the ECM is missing a valid camshaft position signal, or cranking speed/voltage is insufficient. The engine uses high-pressure engine oil to fire the unit injectors; without adequate ICP or a CMP signal the ECM will not command injection. Weak batteries also reduce cranking speed and can prevent start.1

Most likely causes

  1. Low injection control pressure (ICP) during cranking — High-pressure oil leaks, a sticking or faulty injection pressure regulator (IPR) valve, low/aerated engine oil, or a worn high-pressure oil pump prevent ICP from reaching the threshold needed to fire the HEUI injectors. This commonly sets DTC 335.21
  2. Missing or erratic camshaft position (CMP) signal — A failed CMP sensor, damaged wiring/connector, or incorrect air gap causes the ECM to see no or an incorrect CMP pattern while cranking. This commonly sets DTC 145 and DTC 143.341
  3. Low system voltage / weak batteries — Insufficient cranking speed or voltage during start reduces ICP build-up and can cause a no-start or extended crank. Weak batteries are a typical contributor on this platform.15
  4. IPR valve electrical fault — An IPR coil, connector or wiring problem prevents the ECM from controlling injection control pressure. This commonly sets DTC 241.31
  5. Engine oil condition / level — Low oil level, aerated oil, or incorrect viscosity reduces the ability of the high-pressure oil pump to build ICP, leading to hard start or no start. This can be associated with DTC 335.21

How to narrow it down

  1. Read stored Navistar three-digit DTCs with a scan tool or by counting amber engine lamp flashes; note any of DTC 335, 145, 143, 124, 241, 113.
  2. Check battery voltage and cranking speed; load test batteries and verify clean, tight connections.
  3. Inspect engine oil level and condition; look for aeration, contamination, or incorrect viscosity.
  4. Monitor ICP pressure while cranking with a scan tool; compare actual ICP to desired ICP. Low actual ICP points to high-pressure oil leaks, IPR function, or pump capacity.
  5. Command the IPR valve and check IPR duty cycle and response; inspect IPR connector and wiring for damage or corrosion.
  6. Inspect the CMP sensor, connector and wiring for damage, oil contamination, and proper air gap; check CMP signal while cranking.
  7. Perform a high-pressure oil system leak test (diagnostic) to identify external or internal leaks such as injector O-rings, standpipe, or high-pressure pump issues.
  8. Verify intake air heater operation and fuel supply basics (fuel shutoff, filters) to rule out non-HEUI contributors before condemning high-pressure oil components.

Specs and test values

CheckNormal readingWhen to measureSource
Battery and charging voltage12.6–12.7 V at rest when fully charged; about 13.5 V runningEngine off, then running with loads onDieselHub

Parts and tools you may need

Tools you’ll need

Rough cost and difficulty

Likely repairPartsShop laborWho usually does it
Crankshaft or camshaft position sensor$40–$2000.5–2 hrsDIY with tools and a manual
IPR (injection pressure regulator) valve$70–$3000.5–2 hrsDIY with tools and a manual
Battery or charging-system repair$150–$5000.5–2 hrsEasy DIY
High-pressure oil pump (HPOP)$1,000–$1,4003–6 hrsShop

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 does not start after basic checks, or if high-pressure oil system testing is required, have a qualified diesel technician perform the diagnosis. Do not attempt to service high-pressure oil components without proper training and safety precautions.

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 symptom seed — International DT466E (curated) ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

  2. Curated DTC seed — International DT466E (curated) ↩︎ ↩︎

  3. Curated DTC seed — International DT466E (curated) ↩︎ ↩︎

  4. Curated DTC seed — International DT466E (curated) ↩︎

  5. Curated symptom seed — International DT466E (curated) ↩︎