Chevrolet Volt Hybrid Battery Replacement

Codes that show up on the Chevrolet Volt

If a scanner has given you a code, start here. None of them is an instruction to buy a battery — each page says what the code means, what else causes it, and what a proper diagnosis checks.

• P1B70P1B70 is a manufacturer-specific code, so the number alone tells you nothing until you know the badge. On a Hyundai or Kia hybrid it means the battery computer found a cell sitting roughly a volt below the rest of the pack — a real cell drifting away from its neighbours. On a Chevrolet Volt or Cadillac ELR it is far more specific than that: it is the sense circuit for cell group 47 of the pack's 96 groups, and it sets when that circuit reads 0.2 volts or less. That number is the whole diagnosis. A lithium cell group genuinely sitting at 0.2V would be destroyed — the pack's own floor is 2.5V — so a reading that low points at a lost or broken sensing connection far more often than at a dead cell. Same code number, opposite first suspect.
• P0BBDP0BBD reports that the difference in voltage between modules in the high-voltage pack has gone past what the system tolerates. This page is about the GM two-mode hybrids — the Tahoe, Yukon, Silverado, Sierra and Escalade — and the Chrysler Aspen and Dodge Durango Hybrid, which are the same GM system wearing a different badge. Imbalance is not the same thing as a dead pack: it can come from genuine module wear, but it can equally come from a loose or corroded connection making one module look far worse than it is. At this age both are common, and this is one of the few packs in our catalogue we can genuinely rebuild a module at a time. Jeep 4xe owners want the Jeep page instead — the code number is shared and almost nothing else is.

Having this done in the Phoenix metro

• hybrid battery replacement in Phoenix — the price installed, what we do to the old pack, and how long it takes.
• hybrid battery diagnostic — before anyone quotes you a pack, someone should prove you need one.