PIP4910D

SB-10056835-3313
File in Section:
Service Bulletin
Bulletin No.:
Date:
PIP4910D
December, 2014
PRELIMINARY INFORMATION
Subject:
(EREV) Information On Proper Coolant Usage for Ampera / ELR / Volt Cooling Systems
Models:
2014-2015 Cadillac ELR
2012-2013 Opel Ampera
2011-2015 Chevrolet Volt
This PI was superseded to update Model Years. Please discard PIP4910C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
When servicing any of the cooling systems on the these vehicles, which includes the High Voltage Battery Assembly,
pumps, reservoirs, hoses, air separators, radiators, PIM, engine or heater system it is important to use the proper
coolant and water mixture.
Recommendation/Instructions
The Power Electronics / Charging and Battery Cooling systems require a 50/50 mix of GM DEX-COOL® and
de-ionized water. This mixture is available in a pre-mix with bitterant part number 12378390 US, 10953456 Canada,
the pre-mixed coolant is no longer available without the bitterant chemical. Bitterant is a chemical that is added to
products to make them smell or taste extremely bitter and is required in some states. If the GM pre-mixed coolant is
unavailable during service of the above listed systems make sure to use a 50/50 mix of Concentrated DEX-COOL®:
P/N's 12346290 US, 10953464 and DEIONIZED water ONLY. DO NOT use tap water or distilled water.
Dealers should stock the GM Premixed Dexcool part number 12378390 US. The GM premixed Dexcool contains a
50/50 mix with deionized water. DO NOT use tap water or distilled water or concentrations other than 50/50.
Note: When filling the battery pack cooling system make sure to follow proper vac-n-fill procedures and the Hybrid/
EV Battery Pack Coolant Bleed Procedure located in GDS2 under HPCM2 control functions.
Important: Use of any other coolants other than the GM recommended premixed coolant may set internal battery
loss of isolation faults. If the proper GM premixed Dexcool is not used and there is a current loss of isolation code,
you will need to remove the coolant from the hybrid battery cooling system and replace with the proper mix.
When filling the engine cooling system it is preferred to use the same premixed DEX-COOL®:part number 12378390
US, 10953456 Canada, coolant listed above.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is
resolved without completing every step, the remaining steps do not need to be performed.