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Old 03-25-2012, 02:22 PM   #1
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Question o3 impala intermittent start

o3 impala,(3.4),codes:p1926,u1000,u1064. can drive for 20 min. shut car off wait for couple of min. no start wait about 2 hrs starts again. battery, car with wrench and padlock flash on dash,radio says locked, remote door locks don't work and trunk button quit working also. ignition was changed(passlock) car still the same changed or checked all fuses and relays no difference.
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Old 03-25-2012, 02:27 PM   #2
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Do you have the description of code p1926?
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Old 03-25-2012, 02:45 PM   #3
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1926 and 1000 are can communication errors, 1064 seems to narrow it down to communication with the dash integration module.

Circuit Description
The class 2 serial data line communicates information between modules. Each module connected to the serial data line is assigned a recognition code, or address. This code is used in order to identify which modules are communicating. Modules communicate with each other by periodically sending state of health (SOH) messages. When the ignition switch is in RUN, each module communicating on the serial data line sends a SOH message every 2 seconds. This ensures that the system is operating properly. When the dash integration module (DIM) stops communicating on the class 2 serial data line, the SOH that is normally sent on the serial data line every 2 seconds disappears. The module, which expects to receive that message, detects the absence of the message. The module in turn sets DTC U1064 associated with the loss of SOH of the DIM.

Conditions for Setting the DTC
The module does not receive a state of health (SOH) message back from the DIM. The module retries the request 3 times, and then sets DTC U1064.
This DTC only sets if U1300 or U1301 is not current.
Action Taken When the DTC Sets
DTC U1064 is stored in the module.
The module uses the default values for the initialization data.
This DTC does not cause driver warning message to appear.

Conditions for Clearing the DTC
This DTC clears (status changes from current to history) under any of the following conditions:
The module detects a state of health message from the DIM.
At each ignition cycle.
A history DTC clears after 50 consecutive ignition cycles if the conditions for setting the DTC are no longer present.
Current and history DTCs may be cleared using a scan tool.
Diagnostic Aids
DTC U1064 does not normally represent a failure within the module.
When loss of class 2 serial data communication DTCs (DTCs with the letter U as the prefix) are stored as history DTCs, know all possible serial data DTCs set in each module before diagnosing the serial data line.
If U1064 is stored in the module memory, inspect for the same DTC stored in other modules capable of storing this DTC.
If the DTC is a history DTC, the problem may be intermittent.
Test Description
The numbers below refer to the step numbers on the diagnostic table:

U1064 is the result of loss of communication with the dash integration module (DIM). Note that other modules on the class 2 serial data line may also set U1064 if the DIM is not communicating with the serial data line.

Clear all DTCs after the repair procedure is complete.

Step
Action
Value(*)
Yes
No

1
Did you perform the Data Link Communications Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check - Data Link Communications

2
Use a scan tool in order to attempt the establish communication with the dash integration module (DIM).

Does the scan tool communicate with the DIM?
--
Go to Step 3
Go to Diagnostic System Check - Body Control System in Body Control System.

3
Inspect and repair the class 2 serial data line CKT 1807 (PPL) for intermittent connections. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

Is the repair complete?
--
Go to Step 4
--

4
Turn off the ignition switch.
Reconnect or install any connectors or components that were disconnected or removed.
Turn on the ignition switch.
Clear any DTCs.
Is the repair complete?
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Old 03-25-2012, 03:11 PM   #4
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code p1926 is fuel signal bypass for anti theft i do not have manual for car or wiring so i cannot trace problems i have an obd11 scanner that only reads the code and its message not an actuall car scanner
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Old 03-25-2012, 07:25 PM   #5
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i think you are going to have to take it to a dealer
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Old 03-26-2012, 09:49 AM   #6
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i was thinking it might be the ground wires but i don't know where they connect to inside the dash. was looking for answer here instead of a huge repair bill
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Old 03-26-2012, 11:26 AM   #7
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you need to have a scanner that can hook up to your bus and interface with the modules. the only thing you might be able to do yourself is check the wire to the dim, but i dont have the gm manual for that so i dont know where the wires go. dim is usually what they call the gauge pod now.
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Old 03-26-2012, 02:14 PM   #8
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mechanic had dash apart for ignition so i may need to check all the plugins in dash. from what i read it is a wiring problem not a faulty module but, i can't find which wiring is causing problem. thanks for info, i'll post later if i find the problem
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Old 03-26-2012, 02:47 PM   #9
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It should be a purple wire from dim to ?
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Old 03-26-2012, 03:06 PM   #10
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found a diagram;
ipc wire to splice pack 205 is gray. sp-205 to dlc is purple.

dic comm wire is tan to dlc and yellow to sp-205

tdm is purple to s218
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