![]() Shift Solenoid A And B Tests (GM 4.3L, 5.0L, 5.7L).I've written a tutorial on how to test the A and B shift solenoids (also known as the 1-2 or 2-3 shift solenoids) that may be of help and you can find it here: The 4L60-E stays in ‘Limp In Mode’ (note: see Transmission With Both Solenoid Failure And Internal Damage).The automatic transmission does not ‘slip’, no matter how many times you road test your vehicle.You'll have a specific transmission diagnostic trouble code.In conclusion, I want to emphasize that the three most important things that will tell you that you have a solenoid or internal transmission sensor problem are: This is also due to the fact that the transmission is staying in 2nd gear and the gear ratio provided by 2nd gear is gonna' keep the engine working pretty hard at any speed above 35 MPH. At speeds over 35 MPH, the engine feels like it's over-revving.This is due to the fact that the transmission is starting out in 2nd gear. ![]() As you accelerate your vehicle, it feels very underpowered.Your 4L60-E automatic transmission will stay in only one gear no matter what the vehicle speed.P0503: Vehicle Speed Sensor Intermittent/Erratic/High.P0501: Vehicle Speed Sensor Range/Performance.P0500: Vehicle Speed Sensor Malfunction.The speedometer does not work and you might have one of the following trouble codes:.The above are just some of the transmission diagnostic trouble codes you'll see since there are quite a few that I didn't have space to list. P0758: 2-3 Shift Solenoid Valve Electrical.P0756: 2-3 Shift Solenoid Valve Performance.P0753: 1-2 Shift Solenoid Valve Electrical.P0751: 1-2 Shift Solenoid Valve Performance.P0700: Transmission Control System Malfunction.You'll see one or several of the following transmission diagnostic trouble codes: The PCM is also gonna' light up the check engine light (CEL) and store a specific shift solenoid diagnostic trouble code.Here are some very specific symptoms you'll see when a transmission solenoid goes bad: What makes it pretty easy to tell if the automatic transmission failure is just a solenoid related issue is that the transmission doesn't ‘slip’. If any one of these sensors/solenoids fail or the fuse(s) that supplies the solenoids gets blown, the transmission will go into ‘Limp In Mode’. The electronically controlled 4L60-E has several solenoids and sensors that the PCM needs to control the upshifts and downshifts. How Can I Tell If It's Just A Solenoid Failure? The usual cause of this condition is a bad shift solenoid, although some internal mechanical problem/damage can also cause this.Įach one of the above conditions has a specific cause and in the next sections, we'll explore this a bit more in-depth. ![]()
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