2009 GMC Sierra Hybrid Battery Replacement

Codes that show up on the GMC Sierra Hybrid

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, and the manufacturers did not agree. On Hyundai and Kia hybrids it is a high-voltage battery imbalance code and appears in a Kia bulletin alongside P1B74 and P1B96 as a sensor circuit fault. On GM products it points at a specific cell circuit reading low. Reading a generic code list without checking which make it came from is how this one gets misdiagnosed, so the first question here is what you drive.
• P0BBDP0BBD reports that the difference in voltage between modules in the high-voltage pack has gone past what the system tolerates. It is GM's imbalance code on the two-mode trucks and SUVs. 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. Both are common on vehicles of this age.

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.
• hybrid batteries shipped nationwide — outside Arizona, your own shop fits it.