Diagnostic Aids

An intermittent may be caused by a poor connection, rubbed-through wire insulation, or a wire broken inside the insulation.

Check for the following:

• Poor Connection or Damaged Harness: Inspect ECM harness connectors for backed out terminal "BC5", improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.
• Intermittent Test: If connections and harness check okay, monitor a digital voltmeter connected from ECM terminal "BC5" to ground while moving related connectors and wiring harness. If the failure is induced, the voltage reading will change. This may help to isolate the location of the malfunction.

Fig 1: Code E041 Supplemental Wiring Schematic - Cam Sensor Signal

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code E041 Flow Chart - Cam Sensor Signal

Courtesy of GENERAL MOTORS CORP.