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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15133
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2002 k2500 dura max. had code PO-380 & 540. Replace glow

Customer Question

2002 k2500 dura max. had code PO-380 & 540. Replace glow plugs & air intake relay and cleared codes. Need to set monitors for ca. smog. Drove 700 miles. will not set EGR monitors. Been working with GM tecs. about the problem. EGR system okay. At idle MAF drops to 25 grams. Tryed them to set a code. Dissconnected MAF sensor & CTS. Will not set any codes. Replace ECM & Reflashed. Same problem. All date on the tec two are good. ECM saw -40 C when I disconnected the CTS. Still no codes. Went to Tahoe, N0 4WD. Checked encodes on the transfer case with the tec two. Shows encoder okay, goes 2wd, 4wd hi & low. Need to take to my auto repair shop, I am a mechanic, to check the motor @ the transfer case.. All this started when I replace the air intake relay
Submitted: 11 months ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 11 months ago.

Hi there, I am Cam.

With your truck, do the P0380 and P0540, do they reset?

Does the front axle actuator engage?