codes on H1, what do they mean?

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07-24-2012, 05:01 PM

hnymlk1

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codes on H1, what do they mean?

Hi, We have a 2001 H1 that has started to give us problems.

When cold it runs great but after it warms up it loses power and bogs down under acceleration. Can't get it over 50MPH. If you shut off the engine it is hard to start but will run.

Don't know if it's connected but the cruise control goes out at about the same time as the engine acts up.

Replaced the PMD a month ago. Fuel filter new. Fluids topped off.

showing three codes

P0251
P0335
P0380

Can anyone shed some light on what these mean? I don't want to take it in for repairs and be completely in the dark.

Any help would be welcome,
Theresa & Rob

07-25-2012, 12:14 PM

3hummers

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Quote:

Originally Posted by hnymlk1

Hi, We have a 2001 H1 that has started to give us problems.

When cold it runs great but after it warms up it loses power and bogs down under acceleration. Can't get it over 50MPH. If you shut off the engine it is hard to start but will run.

Don't know if it's connected but the cruise control goes out at about the same time as the engine acts up.

Replaced the PMD a month ago. Fuel filter new. Fluids topped off.

showing three codes

P0251 - injection pump/fuel selonoid
P0335 - crankshaft position sensor
P0380 - glow plug heater circuit

Can anyone shed some light on what these mean? I don't want to take it in for repairs and be completely in the dark.

Any help would be welcome,
Theresa & Rob

PM hummech for a complete description of what you might be looking at.

07-26-2012, 11:32 AM

hnymlk1

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I don't have permissions to PM somebody! could you forward to hummech?
Thanks

T & R

07-26-2012, 11:34 AM

hnymlk1

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Also a P0606 is now showing too.

07-27-2012, 05:12 PM

3hummers

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That is the PCM/ECM code. Generally means you have a failing PCM. I will talk to hummech about responding.

07-27-2012, 11:58 PM

hummech

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Location: huntington beach ca.

Posts: 125

hnymlk1, the p0251 is injection pump cam system, p0335 is crank shaft sensor, p0380 is glow plug system and p0606 is internal PCM failure. i wasgoing to say thatthe first couple of fault codes indicates a PCM failure. based on all the info. it needs to have the PCM replace. make sure that it gets programmed for your hummer.

hummech