Weird problem with a 2004 burban 1500
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CF Beginner
Joined: Nov 2024
Posts: 2
Likes: 1
Weird problem with a 2004 burban 1500
Hello group, I’m at my wits end on this truck and can not make sense of it.
Having an issue mainly at highway speed but it has happened once or twice on the road.
Around 70 mph while coasting the transmission will disengage and the engine RPMs will go to idle. A noise will occur. I tap the gas pedal and the transmission will engage and will be ok for a few seconds and will do it again. Once the speed comes down to 50 or so it goes away.
I checked the transmission fluid level and it’s good and red. Tried to wiggle the gas pedal the best I could while driving with no difference. Only this last trip I got a check engine light. Checked the codes and got a P 1516 which is a throttle body performance code, two codes for a lean condition and a MAF code. Cleared the codes took it for another ride and only the 1516 and lean codes came back.
the truck is a 2004 1500 4wd with 225,000 miles on it. I took the throttle body off and can only imagine that it’s the original one.
I don’t know enough about automatic transmissions and what makes them tick to know how a throttle body or other sensors affect it.
and help would be greatly appreciated
Having an issue mainly at highway speed but it has happened once or twice on the road.
Around 70 mph while coasting the transmission will disengage and the engine RPMs will go to idle. A noise will occur. I tap the gas pedal and the transmission will engage and will be ok for a few seconds and will do it again. Once the speed comes down to 50 or so it goes away.
I checked the transmission fluid level and it’s good and red. Tried to wiggle the gas pedal the best I could while driving with no difference. Only this last trip I got a check engine light. Checked the codes and got a P 1516 which is a throttle body performance code, two codes for a lean condition and a MAF code. Cleared the codes took it for another ride and only the 1516 and lean codes came back.
the truck is a 2004 1500 4wd with 225,000 miles on it. I took the throttle body off and can only imagine that it’s the original one.
I don’t know enough about automatic transmissions and what makes them tick to know how a throttle body or other sensors affect it.
and help would be greatly appreciated
CF Pro Member
Joined: Mar 2024
Posts: 668
Likes: 99
From: Huntsville, AL
I am not a transmission mechanic, but did recently replace a solenoid in the valve body of my wife's Subaru - a $50 part versus paying the $5000 the dealer wanted to fix the issue! In our case, the failure was the torque converter lockup solenoid, but thankfully the ODB2 codes told me exactly what solenoid was at fault.
From what you are describing, my thoughts (and these are just guesses mind you) are that if the transmission seems to be disengaging, I would think that is an issue with the torque converter, or a solenoid in the valve body. Or something electrical, since the transmission is electronically controlled. At the speeds you are talking about, you are in the highest gear - what we used to call overdrive - and that would be the first thing to look at I would think. I cannot see the throttle body or even MAF codes causing the symptoms you describe.
Also remember that if this is the original transmission, you are near the end of life, no matter how you slice it. Even well maintained transmissions are doing good to get up to 225,000 miles. I've heard of 250,000. My 2003 Yukon had to have a transmission rebuild at 130,000. Then again, my 1996 C1500 is up to 203,800, with the original engine and transmission.
From what you are describing, my thoughts (and these are just guesses mind you) are that if the transmission seems to be disengaging, I would think that is an issue with the torque converter, or a solenoid in the valve body. Or something electrical, since the transmission is electronically controlled. At the speeds you are talking about, you are in the highest gear - what we used to call overdrive - and that would be the first thing to look at I would think. I cannot see the throttle body or even MAF codes causing the symptoms you describe.
Also remember that if this is the original transmission, you are near the end of life, no matter how you slice it. Even well maintained transmissions are doing good to get up to 225,000 miles. I've heard of 250,000. My 2003 Yukon had to have a transmission rebuild at 130,000. Then again, my 1996 C1500 is up to 203,800, with the original engine and transmission.
Thread Starter
CF Beginner
Joined: Nov 2024
Posts: 2
Likes: 1
I am not a transmission mechanic, but did recently replace a solenoid in the valve body of my wife's Subaru - a $50 part versus paying the $5000 the dealer wanted to fix the issue! In our case, the failure was the torque converter lockup solenoid, but thankfully the ODB2 codes told me exactly what solenoid was at fault.
From what you are describing, my thoughts (and these are just guesses mind you) are that if the transmission seems to be disengaging, I would think that is an issue with the torque converter, or a solenoid in the valve body. Or something electrical, since the transmission is electronically controlled. At the speeds you are talking about, you are in the highest gear - what we used to call overdrive - and that would be the first thing to look at I would think. I cannot see the throttle body or even MAF codes causing the symptoms you describe.
Also remember that if this is the original transmission, you are near the end of life, no matter how you slice it. Even well maintained transmissions are doing good to get up to 225,000 miles. I've heard of 250,000. My 2003 Yukon had to have a transmission rebuild at 130,000. Then again, my 1996 C1500 is up to 203,800, with the original engine and transmission.
From what you are describing, my thoughts (and these are just guesses mind you) are that if the transmission seems to be disengaging, I would think that is an issue with the torque converter, or a solenoid in the valve body. Or something electrical, since the transmission is electronically controlled. At the speeds you are talking about, you are in the highest gear - what we used to call overdrive - and that would be the first thing to look at I would think. I cannot see the throttle body or even MAF codes causing the symptoms you describe.
Also remember that if this is the original transmission, you are near the end of life, no matter how you slice it. Even well maintained transmissions are doing good to get up to 225,000 miles. I've heard of 250,000. My 2003 Yukon had to have a transmission rebuild at 130,000. Then again, my 1996 C1500 is up to 203,800, with the original engine and transmission.
never the less I need to take care of the issue. I hope it’s just a solenoid or something. I’m going to change the throttle body since I’m getting codes for it then it will go to the trans shop.
I just don’t know enough about the internals to mess with it
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TheGreenHulk
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