po300 chevrolet tahoe and po122 no start

Question

truck was running fine no problems ,went out later to truck not starting and codes po122 &po300 truck will turn over all day but no crank? please advise

Answer 1

P0300 Random misfire

P0122 Throttle position (TP) circuit low input

When you cycle the key can you hear the fuel pump come on?, Even with P0300  (random misfire) the vehicle should still start, a P0122 will also allow you to start it wont run right, but it should start. If there is no crank turn on the headlamp if it is dim you may need to jump start the vehicle.