U0511 Code:

OBD-II Diagnostic Network (U) Trouble Code

Possible Cause

U0511 leads to an unsuccessful repair. Engine misfire codes, lean exhaust codes, fuel injector codes, and virtually any other drivability or transmission code that is accompanied by a controller communication code can potentially be a pitfall for misdiagnosis.

Common Symptoms

  1. The first wire is a reference voltage signal (usually 5-volts), the second wire will normally be a ground wire, and the third wire will be a signal wire
  2. Engine and transmission ground cables, straps, and wires are sometimes left dangling after repairs are performed
  3. If the fluid smells or appears burned, remove the transmission pan and check for the presence of clutch material and other debris
  4. There are several tools which will be instrumental in attempting to successfully diagnose the conditions which contribute to this code being stored

Similar Problems

Transmission
Vehicle Speed Output Circuit
Cruise Vehicle Speed/Set Speed Difference Too High

U0511 Troubleshooting

If this is the case with the code, you will be hearing very loud noises, like explosions, from the rear of the vehicle upon acceleration. Firstly check the carburetor to ensure that the fuel and air combination are properly balanced. If these settings are correct, then thoroughly inspect the distributor cap for any cracks or hairline splits, as this can produce a backfire. Move on to the spark plugs and ensure that they are clean and undamaged and inspect the engine gaskets for any sign of damage, as they are responsible for ensuring the correct gas exchange within the engine. U0511 OBD 2 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.

How to turn off U0511 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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