Big T
Well-Known Member
New to me '99 Suburban purchased in Illinois Saturday and driven to California arriving Sunday. Made the trip in 28 hours tag team driving with my son. The best scenery (Rockies) were done at night, everthing up to that point looks the same.:rolleyes5:
After filling up in Salina, Utah, was going up a a grade on I 70 and the SES light came on. Everything was running fine, so we continued on. Just checked it with a code reader and got P0236 - Turbo Boost. Truck has Turbo Boost, EGT and Tranny Temp gauges in a pillar pod just like my '95. Was not watching the boost gauge when the light came on, but it was in OD and it would never get above 6 psi in OD. It felt like the engine was lugging somewhat, but I was going 70 mph up the grade to a 7000' pass. The highest I saw the boost go on the trip was 12 psi and that was when I mashed the pedal to see what it had. The ATT turbo seems to perform like the stock GM 4/8 until you really get into the pedal. I can see why they call it a towing turbo.
Anyway, got any ideas what caused the P0236 code? After a cold start the SES did not come back on, but the code is in memory. It has the Heath GL4 flash on it. Aside from this issue, the truck ran great, though it is much more noisier in the cab than my '95. It's diesel clatter noise, not turbo whistle. Could that be the result of the ATT and the punched out soot trap in the 4" exhaust vs the exhaust back pressure of the stock GM 4 and in place soot trap on my '95? Outside the engines sound very much the same.
Question for the mods: Need help on updating my sig line.
After filling up in Salina, Utah, was going up a a grade on I 70 and the SES light came on. Everything was running fine, so we continued on. Just checked it with a code reader and got P0236 - Turbo Boost. Truck has Turbo Boost, EGT and Tranny Temp gauges in a pillar pod just like my '95. Was not watching the boost gauge when the light came on, but it was in OD and it would never get above 6 psi in OD. It felt like the engine was lugging somewhat, but I was going 70 mph up the grade to a 7000' pass. The highest I saw the boost go on the trip was 12 psi and that was when I mashed the pedal to see what it had. The ATT turbo seems to perform like the stock GM 4/8 until you really get into the pedal. I can see why they call it a towing turbo.
Anyway, got any ideas what caused the P0236 code? After a cold start the SES did not come back on, but the code is in memory. It has the Heath GL4 flash on it. Aside from this issue, the truck ran great, though it is much more noisier in the cab than my '95. It's diesel clatter noise, not turbo whistle. Could that be the result of the ATT and the punched out soot trap in the 4" exhaust vs the exhaust back pressure of the stock GM 4 and in place soot trap on my '95? Outside the engines sound very much the same.
Question for the mods: Need help on updating my sig line.