Codes P1642, P1384 & P1797 after heavy rain?
Thread Starter
|
Member
Joined: Jul 2016
Posts: 34
Likes: 4
From: El Dorado Hills, Ca
Codes P1642, P1384 & P1797 after heavy rain?
Car was running fine. Went to work, then after work car had trouble starting. After i finally got it startrd it wouldn't idle and then stall. I ended up nursing it home with 1 foot on the brake and 1 on gas. This all comes after heavy rainfall. 2-3 days of it. Not sure if this is relevant or not. Any ideas? CEL is on but its always on. Nothing new there.
Joined: Apr 2012
Posts: 25,844
Likes: 4,707
From: Summerville, South Carolina
Debbie - it would help to have vehicle details so techs can provide accurate assessment of codes for the particular model year (in this case a 1999 XK8)
moisture could be a cause but how old is the battery as weak battery will lead to some weird faults.
In any case,
1384 is a VVT Solenoid fault
When CK ENG MIL is activated (DTC flagged; second trip), ECM:
Sets VVT drive PWM duty cycle to 0 (intake camshaft fully retarded)
Possible Causes
VVT solenoid valve to ECM PWM drive circuit fault
VVT solenoid valve to ECM ground circuit fault
VVT solenoid failure
VVT oil flow fault
VVT / camshaft mechanical failure
1642 is CAN circuit malfunction:
When ECM detects fault:
– Limits throttle to approximately 30%
– Inhibits cruise control
Possible causes: (All CAN data unavailable)
CAN short circuit fault
Control module failure – check for additional flagged DTC(s) to locate control module source
1797 CAN ECM Token message missing:
When fault is detected:
– TCM adopts transmission mechanical limp home mode (4th gear)
– ECM limits engine power
Possible Causes
Other CAN control module CAN related fault(s)
CAN open circuit fault – ECM to TCM
CAN short circuit fault
ECM failure
TCM failure
moisture could be a cause but how old is the battery as weak battery will lead to some weird faults.
In any case,
1384 is a VVT Solenoid fault
When CK ENG MIL is activated (DTC flagged; second trip), ECM:
Sets VVT drive PWM duty cycle to 0 (intake camshaft fully retarded)
Possible Causes
VVT solenoid valve to ECM PWM drive circuit fault
VVT solenoid valve to ECM ground circuit fault
VVT solenoid failure
VVT oil flow fault
VVT / camshaft mechanical failure
1642 is CAN circuit malfunction:
When ECM detects fault:
– Limits throttle to approximately 30%
– Inhibits cruise control
Possible causes: (All CAN data unavailable)
CAN short circuit fault
Control module failure – check for additional flagged DTC(s) to locate control module source
1797 CAN ECM Token message missing:
When fault is detected:
– TCM adopts transmission mechanical limp home mode (4th gear)
– ECM limits engine power
Possible Causes
Other CAN control module CAN related fault(s)
CAN open circuit fault – ECM to TCM
CAN short circuit fault
ECM failure
TCM failure
Veteran Member
Joined: Dec 2010
Posts: 8,835
Likes: 2,924
From: Douglasville Ga.
The ground strap between the bell housing and frame on the passenger side may need to be disconnected and cleaned. It does get wet and may have some corrosion.
A friend with a XK8 had a similar problem after driving in heavy rain and it was due to water getting into the aging electrical connections. Other members have reported problems after pressure washing the engine or just going through a car wash.
A friend with a XK8 had a similar problem after driving in heavy rain and it was due to water getting into the aging electrical connections. Other members have reported problems after pressure washing the engine or just going through a car wash.
Joined: Oct 2009
Posts: 11,057
Likes: 2,272
From: Perth Ontario Canada
Car wasn't really running fine then.
Some or all of your present codes were already there. Delete them all and start again to see which ones reappear.
Some or all of your present codes were already there. Delete them all and start again to see which ones reappear.
Veteran Member
Joined: May 2009
Posts: 27,520
Likes: 4,910
From: Yorkshire, England
Only one of those two is correct.
What was the cause of the existing MIL (proper name for CEL)?
Be prepared in case with several faults proper diagnosis is very hard. Tends to be far easier to diagnose and fix one fault at a time.
What was the cause of the existing MIL (proper name for CEL)?
Be prepared in case with several faults proper diagnosis is very hard. Tends to be far easier to diagnose and fix one fault at a time.