P0A2B on Mazda: How to Diagnose & Fix
Drive Motor "A" Temperature Sensor Circuit Range/Performance
1 Mazda model · 1 documented issue · 1 critical
P0A2B on Mazda by model: symptoms, diagnosis and fix
On 3.3 Turbo / Turbo S mild-hybrid (MHEV) CX-90s, one or more of the 12 cells in the 48-volt MHEV battery can become voltage-imbalanced, storing DTC P0DAB (cell voltage variation). The vehicle illuminates the engine malfunction warning, drops to an engine-only fail-safe mode, and disables M Hybrid Boost, i-stop, and regenerative braking; CX-90 forum owners report dealers calling the car unsafe to drive. This 48V MHEV battery fault is distinct from the inverter/PCM software loss-of-power recalls (7024J / 24V815 / 24V817).
Common Symptoms
- Engine malfunction / warning light illuminated
- Loss of motor assist (M Hybrid Boost) and weaker acceleration
- i-stop and regenerative braking stop working
- Dealer warns the vehicle could lose power
- Limp / fail-safe engine-only mode
How to Fix
This is handled as a Mazda technical service / warranty (MSP) matter, not the software recalls: when DTC P0DAB is confirmed, the 48-volt MHEV battery is replaced under warranty per Mazda's MHEV battery service procedure (NHTSA TSB document MC-11016241). NOTE: do NOT conflate this with Safety Recall 7024J (NHTSA 24V816) or 24V815/24V817, which are inverter/PCM/ECM software reflashes for separate loss-of-power DTCs (e.g., P0A2B) and do not address P0DAB cell imbalance.
Sources for this issue (3)
P0A2B code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0A2B mean on a Mazda?
P0A2B stands for "Drive Motor "A" Temperature Sensor Circuit Range/Performance." The drive motor 'A' temperature sensor signal is implausible or out of expected range for operating conditions. On Mazda it is documented across 1 model: CX-90.
What are the most common causes of P0A2B?
The most common causes of P0A2B are: Drifting/aging temperature sensor, High-resistance connection, Cooling system issue, Control module fault. The specific cause varies by vehicle.
How much does it cost to fix P0A2B on a Mazda?
Repair costs vary widely with the root cause and Mazda model; each issue on this page carries its own estimate where one is published.
Looking for P0A2B on a different make?
View P0A2B across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.