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What causes limp mode?

 
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Old 10 Jan 2019, 03:35 pm
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Default What causes limp mode?

I have a 2006 turbo with automatic transmission. 100,000 miles with timing belt replaced. It went into limp mode. Parked over night it was OK in the morning. There seems to be two flavors of limp mode. In one mode all four gear shift position lights are lit and the speedometer does not work, but the tack does and the car stays in limp mode. In another the gearshift position light and speedometer work correctly, but the car is in limp mode (2nd gear). The condition occurs randomly, and will often times go away after turning the car off. Once it starts and is OK, it stays OK until you turn it off. If you turn the key on and all four shift position lights are lit it will start in limp mode for sure. If only park is lit, it may or may not come up in limp mode. I replaced the TIPM and the intermittent behavior stopped for a couple of days and now it is back. I understand that after replacing the TIPM sometimes reprograming of something is required. I did not do that. Any ideas?
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Old 10 Jan 2019, 07:16 pm
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Default Re: What causes limp mode?

How soon after replacing the timing belt did the limp mode start?
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Old 10 Jan 2019, 07:26 pm
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Default Re: What causes limp mode?

Where did you get the replacement TIPM from?

New (remanufactured) or used (salvage yard)?
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Old 10 Jan 2019, 09:13 pm
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Default Re: What causes limp mode?

Back when I had the problem with the 2005, it was a loose wire to the tranny sensor.
They replaced that sensor twice, before they noticed the loose wire on the connector.
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Old 11 Jan 2019, 09:44 am
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Default Re: What causes limp mode?

The limp mode occurred almost a year after replacing the timing belt.

The TIPM was rebuilt. I had the problem with the first one they sent me, so I sent it back and had the problem again. I doubt it is the TIPM.

I am busy checking wires and grounds.

Anything else?

Thanks for the info.
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Old 11 Jan 2019, 10:21 am
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Default Re: What causes limp mode?

When all the PRNDL lights up on the dash does the reverse lights still light up if you put it in reverse?
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Old 12 Jan 2019, 12:26 pm
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Default Re: What causes limp mode?

I'd check the wiring at the front of the tranny. Especially the TRS connector and the solenoid connector. And the grounds along the left inner fender.

After a week of easy driving, the computer should reprogram [adjust] itself. However, if there is updated software [TSB], you may want to have it reflashed.
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Old 12 Jan 2019, 02:16 pm
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Default Re: What causes limp mode?

Quote:
Originally Posted by ptcruisersteve View Post
When all the PRNDL lights up on the dash does the reverse lights still light up if you put it in reverse?
All Lights stay on no matter where I put the shift lever. It goes in reverse OK, but stays in second regardless of which forward gear I put it in.
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Old 12 Jan 2019, 02:41 pm
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Default Re: What causes limp mode?

Quote:
Originally Posted by PTRick View Post
All Lights stay on no matter where I put the shift lever. It goes in reverse OK, but stays in second regardless of which forward gear I put it in.
I met where you get out of the Pt Cruiser and see if the reverse lights are on on the back of the Pt Cruiser.
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Old 12 Jan 2019, 06:07 pm
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Default Re: What causes limp mode?

Don't know. I will check. I don't have the PT here right now. It is in the shop.
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