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1998 Deville

Can anyone tell me what the code P0371 means ... "Too many pulses"? Exactly what does that mean and what could cause that? First time the car's ever thrown that code.

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This diagnostic test checks for more than forty nine 24X reference pulses between CAM pulses. However, the number of 24X pulses is allowed to vary between 47 and 49, as long as any variances toggle between too few pulses, and too many pulses. If two variances don't toggle, i.e. they both had 49 reference pulses and 8 4X reference pulses were received between CAM events, then DTC P0371 is set because too many 24X pulses were received

    Checking for possible cause of noise (extra 24X pulses) on the 24X spark reference circuit.
    If DTC resets, fault is still present. If DTC does not reset, fault has been eliminated.
    Checking for poor terminal contact at the IC module or PCM that may cause the DTC to set.
    Check for possible sources of EMI (Electromagnetic Interference):
  1. Spark plug wires run along side the Ignition Control (IC) module.
  2. High power transmitters operating in the vicinity (such as mobile radios).
  3. Various testing equipment.
  4. A battery charger

Check terminal contact at IC module connector C4 terminal A.

Check terminal contact at PCM connector C2 terminal 5.

Repair terminal contact if needed

Replace the Ignition Control module

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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