04/18/2026
When you think you had your car "diagnosed" because someone read the codes... there is so much more that goes into finding the correct problem...
This vehicle came in on a tow because it went into limp mode and then would not crank or do anything. It presented with these codes..
P00C7 Intake Air Pressure Measurement System Multiple Sensors Not Plausible
(Symptom 00) Current DTC, Test Failed Since DTC Clear, Test Not Passed
Since Power Up.
P0192 Fuel Rail Pressure Sensor Circuit Low Voltage (Symptom 00) Current DTC,
Test Failed Since DTC Clear, History DTC, Test Not Passed Since Power Up,
Warning Indicator Requested.
P0341 Camshaft Position Sensor Performance (Symptom 00) Current DTC, Test
Failed Since DTC Clear, Test Not Passed Since Power Up.
P0532 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage
(Symptom 00) Test Failed Since DTC Clear, History DTC.
P0641 5V Reference 1 Circuit (Symptom 00) Current DTC, Test Failed Since DTC
Clear, History DTC, Test Not Passed Since Power Up, Warning Indicator
Requested.
P2227 Barometric Pressure (BARO) Sensor Performance (Symptom 00) Current
DTC, Test Failed Since DTC Clear, History DTC, Current DTC Since Power
Up, Warning Indicator Requested.
P2228 Barometric Pressure (BARO) Sensor Circuit Low Voltage (Symptom 00) Test
Failed Since DTC Clear, History DTC, Warning Indicator Requested.
P2230 Barometric Pressure (BARO) Sensor Circuit Erratic (Symptom 00) Current
DTC, Test Failed Since DTC Clear, History DTC, Test Not Passed Since
Power Up, Current DTC Since Power Up, Warning Indicator Requested.
Upon proper diagnostic that includes looking at TSBs from the manufacturer (technical service Bullitins) I was able to locate a corrosion incident that was causing an intermittent short on the 5 volt power supply that was causing all these codes...
I want everyone to know there is a LARGE difference between a code read and proper diagnostics....
So please stop trying to get shops to properly diagnose your vehicle for free... Time is money.... and it is well worth spending the money for proper diagnostics instead of just shoving parts at a car... I know at least this vehicle owner will be happy to have this solved..
Yukon Denali