B336 Loss of IPC Serial Data

Code B336 - Loss Of IPC Data:

Wiring Diagram for Codes B334, B335, B336 & B337:

CODE B336 - LOSS OF IPC DATA

Circuit Description:

Code B336 will set if the ignition is on and the BCM is not able to exchange data with the IPC. This means the problem must be caused by two opens in the data circuit, one on either side of the IPC or loss of power or ground to the IPC.



Test Description:

1. Checks to see if the fault is due to a data circuit problem or a power or ground circuit problem.

2. Checks to see if the data circuit problem is due to the IPC or the wiring.

3. Checks to see if the open circuit is due to the CRTC. Installing a permanent jumper between the CRTC terminals will bypass the opens.

4. Checks to see if the fault is due to opens in CKTS 800G and 800H or the IPC cannot react to the data it is receiving.

5. Checks to see if the power or ground circuit problem is due to the 12 volt circuits or the 7 volt and ground circuits.

6. Checks to see if the loss of the 12 volt circuits is due to the wiring or the IPC.

7. Checks to see if the fault is due to the 7 volt circuit or the ground circuit.



Note of Intermittents:

If only code B336 shows up as "History", check for momentary opens in CKT 800H and 800G, or momentary loss of both 12 volt circuits (812GA and 812GB), or momentary loss of 7 volt (CKT 807H), or momentary loss of ground (CKT 801H).

If code B336 is set as "History", along with any of the following codes set as "History"; B334, B335, B337, B552, B553, E047, see chart on "Multiple Intermittent Codes."