Check U1091 Fault Code

When you check engine light came on code U1091 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However your vehicle's manufacturer may have a different definition for the U1091 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on our car models.

U1091 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.

U1091 Possible Fix :

Detonation, or spark knock, is a type of combustion caused by the buildup of too much heat and pressure in the engine's combustion chamber. When this happens, you should be able to hear a metallic knocking or pinging noise. A small amount of detonation usually won't cause major damage, but heavy knocks or prolonged detonation can cause serious damage to your parts. It can punch holes in your pistons, crush rod bearings, blow head gaskets, crack rings, and pound out piston ring grooves. Prolonged pinging noises are a definite cause for concern.

U1091 OBD-II Diagnostic Network (U) Trouble Code Description U1091 SCP (J1850) Invalid or Missing Data for Non-Legislated Diagnostics so you have to check ODB-II Fault Code Check list. Reason For U1091 Code The reason of U1091 OBD-II Fault Code Check is U1091 SCP (J1850) Invalid or Missing Data for Non-Legislated Diagnostics.

U1091 Solution:

Power Steering Pressure (PSP) Switch Signal Malfunction The PCM counts the number of times vehicle speed transitions from 0 to a calibratable speed. After a calibratable number of speed transitions the PCM expects that the PSP input should have changed. This DTC is set if the transition is not detected. Vehicle towed with engine running Power steering hydraulic concern was repaired but DTC was not erased PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged Check, if possible, if vehicle was towed or power steering service was performed. Observe PSP V PID while checking wires for intermittents.

What does fault code U1091 mean ? What does a diagnostic reading U1091 mean ? How to fix OBD2 Code U1091 ? What do we know about U1091 code ?

How to Clear U1091 Trouble Code

An OBD 2 scanner is the best and safest way to erase a DTC from your car's system. This scanner communicates with the car's computer and instructs the computer to erase the code. It does not change or tweak the settings from inside the car or its systems.