Low battery voltage cause for tranny bump and air suspension issues ? - Jeep Garage - Jeep Forum

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Old 08-01-2014, 11:35 AM
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Low battery voltage cause for tranny bump and air suspension issues ?

I had my 2014 EcoDiesel GC (8 months old, 15K miles) in the shop this week for two primary warranty issues:
REAR SUSPENSION BUMP, which was getting more frequent and pronounced
SERVICE AIR SUSPENSION SYSTEM IMMEDIATELY, a new event

The air suspension issue occurred only at startup and came with an engine start issue. The ignition would turn over once and then stop as if the battery was low or dead. After three tries, the Jeep would start and operate normally. I checked the EVIC voltage readout, which read 14V. This event happened three times over a period of 10 days. The air suspension message never came on during normal driving, and additional starting issues were not evident in normal daily driving.

Before the service department even got to the two primary needs, WiTECH diagnostics indicated the Jeep had thrown 33 trouble codes: ECU. TVM. PCM, ABS, ECM, ASCM, ORC, EPS, AFLS, HVAC, DDM, PDM, MSM, PLGM, PTS, SCCS, BCM, ACC, HSM, and RADIO. All but one of the trouble code descriptions were "System Voltage-Circuit Voltage Below Threshold" or "Lost Communication With Telematics Gateway".

The Jeep went to electrical where the battery was replaced. The service tech tells me that when the mainframe senses low voltage; it interrupts secondary communications to protect primary circuits, which is probably why there were communication errors with the telematics.

Service moved to the other items, and unexplainably, the rear transmission bump cannot be duplicated nor are there issues with the air suspension system. I drove the vehicle home that evening in stop/go traffic, not a single bump. The voltage readout was 13V.

While at the shop, the HVAC flash update was installed. While I was not having issues with the hot cabin, the HVAC did seem slow to cool and vent distribution was erratic on AUTO. The update provided excellent results, the AC is now more accurate with cabin temp setting and seems to be colder.

The message here is that a battery voltage issue, even one that will still start the vehicle, can apparently cause many problems with components. I suspect that the continued heavy use of telematics may prompt manufacturers to consider two batteries in future designs: one for cracking power, one for secondary electronics.

When a problem does not seem to make sense, and we seem to read about these on the forums, owners might be wise to request service to do a battery load test to ensure proper voltage. As seen in my situation, checking the EVIC display will not provide this data accurately enough.

Extreme temps are hard on batteries, hot or cold. With predominantly heat in TX, after warranty, I am considering an annual battery purchase as prudent PM. That is not much of a stretch since most batteries in the south rarely last two years anyway.

I think the voltage issue was responsible for the air suspension issue, but I question the transmission bump. After a few more hundred miles, I will post again if the bump or suspension issue returns.

My issues have been few, the dealership service has been good (River Oaks, Houston, TX), and I still enjoy the driving experience of this JEEP.

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