Truck not shifting upshifting out of first just super high rpms

Asked by gofastfishing Nov 06, 2022 at 02:05 AM about the 2003 Chevrolet Avalanche

Question type: Maintenance & Repair

Bought truck 2 weeks ago..I drove it 20 miles.check engine
light came on and from that point on it wouldn't upshift from
low gear.no matter what gear I start  in it won't go passed
40.and almost red lines..light was knock sensors. So I
replaced them and harness.still won't shift. I I changed shift
servo and shift siliniods and filter. Still same. Help me please

1 Answer
1,880

Carpentar answered 2 years ago

What does the trans code say exactly. Like pressure control circuit A open shorted, torque converter slippage, over shift learn exceeded? 4L60E is a decent gear box if serviced and cared for, issues stem from one of three scenarios 1 abuse 2 lack of service, trans controller needing a software update. Suburban Yukon and Chevy in the 1500 group all suffer from ecm failure at some point. Impossible number of codes from 02 to reduced engine power are all tells ecm is needed beating an improper shifting trans is a killer.

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