Tip & How-To about 1991 GMC Sonoma
DTC - 12
No distributor reference pulse (diagnostic test active)
DTC - 13
Oxygen sensor circuit open or no activity
DTC - 13 Left bank O2 sensor circuit open or no activity
DTC - 14
Engine coolant temp sensor error (high temp indicated)
DTC - 15
Engine coolant temp sensor error (low temp indicated)
DTC - 16
System voltage too low
DTC - 17
Camshaft position sensor error
DTC - 21
Throttle Position sensor error (signal high)
DTC - 22
Throttle position sensor error (signal low)
DTC - 23
Intake air temp sensor error (low temp indicated)
DTC - 24
Vehicle speed sensor error (open circuit or no activity)
DTC - 25
Intake air temp sensor error (high temp indicated)
DTC - 26
Quad Driver Module (QDM A) error
DTC - 28
Auto transmission range pressure switch error
DTC - 31
Wastegate solenoid circuit error
DTC - 31 Gear Position Switch (PRNDL) error
DTC - 32
EGR system failure
DTC - 33
MAP sensor circuit error (signal high indicating low vacuum)
DTC - 34
MAP sensor circuit error (signal low indicating high vacuum)
DTC - 35
IAC problem or idle error
DTC - 36
MAF sensor error
DTC - 36 24x Crankshaft position sensor circuit error
DTC - 36 4T60-E Shifting Error
DTC - 37
TCC brake switch circuit error
DTC - 38
TCC brake switch circuit error
DTC - 39
Clutch switch circuit error
DTC - 39 TCC error
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