Note On INTERMITTENTS

If an intermittent Code B334 is being set, manipulate related wiring at PCM. With ignition on (engine not running), a LOW OIL PRESSURE message will indicate loss of PCM communication and possibly help isolate intermittent without having to look for code. Also check PCM and MEM-CAL connections.

Fig 1: Code B334, Schematic, Loss of ECM Data

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code B334, Flow Chart, Loss of ECM Data

Courtesy of GENERAL MOTORS CORP.