Question about 2009 Chevrolet Avalanche
ONLY WHEN TRUCK IS PLUGGED IN, WITH TEMP BELOW -18 C SO BLOCK HEATER KICKS IN, AND USING THE FACTORY REMOTE START TO START VEHICLE, DOES THIS CODE P1400 COLD START EMISSION REDUCTION SET. AFTER THIS SETS, THEN CODE P0300 ENGINE MISFIRE SETS ALSO. HAS ALL LATEST SOFTWARE CALIBRATIONS IN ECM, BCM, TCM, RCDLR. IF STARTED MANUALLY WITH KEY, ALL WORKS AS INTENDED.
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Posted on Jan 02, 2017
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DTC P1400 - Differential
Pressure Feedback Electronic (DPFE) sensor signal was below 0.2 volts.
Enabling conditions: Run engine off or running self tests to check this
Blocking Action: This code can block the following monitors: Fuel Control, O2 monitor, catalyst, misfire, and EGR monitor.
Run the engine off and running self tests. If the code does not show
up, it is an intermittent problem. Check for 5 volt reference that is
low, damaged sensor or a short to ground in the signal wiring. Probes
use an EGR position sensor signal which can be low because of a worn EGR
pintle that drops too low in the EGR valve or for a warped EGR valve
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