Join Date: May 2014
Location: San Andreas Fault Zone
Mentioned: 129 Post(s)
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Quoted: 1315 Post(s)
Re: Drove til batt dead, now P0420 & P0430
The major concern initially is the C1201 code, "Engine Control System Malfunction".
This indicates some problem with the engine control system, electronically a pretty complex system with many sensors, actuators, and a lot of wiring harness with many connectors. Simply running the battery down to the point where the engine stopped running should not have induced any permanent damage in any of the control system components, although if the engine ran excessively rich for the last 10-20 minutes of life it is possible that the air/fuel or oxygen sensors are fouled.
1. At any point in this incident did you "jump start" the engine, or connect any type of auxiliary DC power supply to the vehicle?
2. Have you verified the engine-off battery voltage? It should be 12.6 - 12.9 volts measured at least 1/2 hour after engine shutdown.
3. Have you verified the battery charging voltage with the engine running at ~2K RPM, with all major electrical loads turned off? It should be between 13.2 to 14.8 volts.
These voltage measurements should be made with a good quality digital voltmeter, NOT an $8 Harbor Freight model. Make these measurements at the battery clamps, then also again at the battery posts.