Diesel Trouble Codes

P0341 — Camshaft Position Sensor A Circuit Range/Performance (LB7 Duramax)

Diagnostic reference for LB7 Duramax (2001-2004) P0341. Rank causes most-likely first.

Updated September 2, 2026

What it means

The ECM has detected the camshaft position sensor signal is outside the expected range or performance. On the LB7 Duramax the engine is gear-driven with a single cam sensor and a crank sensor at the rear [authoritative platform facts].1

Most likely causes

  1. Camshaft position sensor signal out of range/performance — The generic definition for P0341 is camshaft position sensor signal outside expected range or performance.1
  2. Wiring/connector fault to the camshaft position sensor — Circuit range/performance can be caused by electrical or signal faults in the sensor circuit. A related crank sensor circuit malfunction definition shows ECM detection of electrical/signal fault in position sensor circuit.2
  3. ECM signal processing anomaly — Affected systems include Engine Control Module.1

How to diagnose

  1. Verify code P0341 is present and check freeze frame for engine speed/load at set.
  2. Inspect camshaft position sensor connector and wiring for damage, oil contamination, and secure lock.
  3. Check sensor supply voltage and ground per service information; compare to known-good values.
  4. Monitor camshaft position sensor signal with a scan tool during cranking/running; look for dropouts or erratic pattern.
  5. Compare camshaft vs crankshaft correlation using scan data; gear-driven timing reduces mechanical timing variance but sensor signal quality remains critical.
  6. If signal is erratic, test wiring continuity and isolation to ECM; repair wiring faults before replacing sensor.
  7. If wiring tests good and signal remains out of range/performance, replace camshaft position sensor and re-evaluate.
  8. Clear codes and road test to confirm repair.

Parts and tools you may need

Rough cost and difficulty

Parts cost varies by brand and source; labor varies by shop. Estimates are indicative only.

When to see a pro

If correlation cannot be verified, if wiring faults lead into the ECM harness, or if the engine exhibits hard start/no-start, consult a qualified diesel technician. Do not attempt step-by-step repair of safety-critical systems. This guide is diagnostic only.

Sources

  1. Curated DTC seed — LB7 Duramax (curated) ↩︎ ↩︎ ↩︎

  2. Curated DTC seed — LB7 Duramax (curated) ↩︎