1. Fluid level okay while running, warm, level surface. Yes
1a. Fluid color and smell. Slightly brown. Doesnt smell burnt
2. Speedometer reading correctly. Yes
3. Shifting normal/hard. Sometimes
4. Shifting into OD okay? Sometimes
5. Any service engine light: yes
6. If SES light on, what codes do you have? P0216 INJECTION PUMP TCC
7. Model year: 2000
8. Describe symptoms: It will slip out of overdrive and I have to pull over and turn off the key a couple of times to get it to go back into overdrive.
9. Does the engine come up to full temperature? Yes
10. Any service work recently done that may contribute to your issues. Injectors and Injection Pump is all.
11. Does the TCC lock up (or how many "shifts" do you hear?) 3

12. Are you experiencing any kind of slipping? Just from overdrive

13. What type of rear do you have? (Check RPO codes) 4.10/ 3.73/ 3.42 or 3.08. Not sure. Its a 2000 Chevy 3500 HD.

14. If you have an accurate tachometer, what is the RPM at 55 or 65? 65 is about 2900

My truck slips out of overdrive and you have to pull over and turn the key off to get it back into overdrive. My check engine light came on but it was for Injection Pump Timing Control Circuit. P0216.

I am at a loss here. The dealership wants 3400 to replace. I truly dont think it is mechanical. thanks

Slipping put of overdrive? Do you mean going out of lockup into a lower gear? Or.. from Overdrive into high revving?

High revving is often referred as engine flare up.

Slipping out of overdrive could be caused by low oil level and can be as easy as that.

Torque Converter solenoid (bad). Bad wiring to and from tcc solenoid checking from the computer. TCC Valve or worn valve bore. enabler valve at the pump.

Low pressure to the Torque converter clutch.

Oil pump bushing worn.

Thank you for your reply as I am about wits end with this truck. I took it to a dealership and the code P0216 was resolved. Apparently a female pin was pushed all the way back on the "stepper motor?". It is a wiring harness where the IP is located.

They said they couldnt get the transmission to "slip" again although there was a code for it when I took it to them.

I dont belive I am getting lockup. I do know it is getting to 4th gear. The problem would be dropping out of 4th into 3rd and then not going back to 4th. I would have to pull over for a few minutes and cut the truck off and everything would be fine.

They dropped the transmission pan and did not see any metal flakes and said the transmission seemed to be in better condition than what they thought.

They want me to drive it around more to see if something happens to more easily identify it.

This truck has 81000 miles on it. It is a cable tv boom truck so it is always under load. Again Thank You.

You are welcome.
Stepper motor. HMMM I am going to have to dig for that one. I am wondering if that is the pressure control solenoid. I believe it is.
Stepper motor
Force motor
This solenoid is variable width and easily found out by using a techII. It is detected by checking amps going to it.
This solenoid controls line pressure. The total pressure within the transmission.
Not to be confused with governed pressure.

Line pressure is also neede to hit lockup in Overdrive.

:):):):)

Ok. It did slip again today. I looked at the bottom of the tranny and seen that their is some fluid leaking there. If the transmission is suppose to have 4 shifts total, I am only getting 3.

I thought they were going to check out selinoids while pan was down but they didnt.

I had a similar problem once. Mine would come out of overdrive also. It ended up being the coolant temp sensor. It made the computer think the engine was cold enough to keep it out of overdrive.

Get it checked out with a tech II diagnostic troubleshooting tool.
If it is slipping out of OD.
TCC solenoid sends a signal to the pump. valves in the pump open and let line pressure into the torque converter locking it up.
Left unchecked and untended over time may lead to damage to the torque converter.
Why? Leaking valves and they need to be wet tested to find out if they are sealing. Not the only reason but a good one.
Throttle Position Sensor should always be checked and verified for correct adjustment and this should be done with the engine warmed up.
Temp sensors play a role in advance timing and transmission fluid temperature. If the temp in the trans is too hot or percieved to be too hot than the computer will not allow Lockup.
A good technician with a tech II or a snap-on Modus can spot problems quickly with no excuses with minimal charge to the business owner. You do not need excessive costs added to you.