Code B552, BCM Keep Alive Memory Error
Code B552 does not necessarily indicate a fault, but is a normal occurrence anytime battery power or ground to BCM has been interrupted. Code B552 cannot be cleared from memory in the normal manner. Code B552 can only be cleared if it is not current. Under normal conditions, code will become history under the following conditions:
- Ignition in lock position
- Wait for 5 seconds
- Ignition key on, re-enter diagnosis
After the above conditions have taken place, code should now be history, and can be cleared in the normal manner. This code could be set if the system voltage drops to less than 8 volts at BCM terminal No. 1C9. Possible causes for this are faulty charging system, starter system, extreme cold weather and jump starting vehicle.
Test Number 1) This step is to change Code B552 from current to history.
Test Number 2) Checks to see if Code B552 was set due to a fault during cranking mode.
Test Number 3) Checks for adequate system voltage at BCM terminal No. 1C10. System voltage must not drop to less than 8 volts during engine cranking. By removing fuel pump fuse, engine will not start and voltage during engine cranking can be observed.