P1A00 on Ford
Motor Electronics Coolant Pump Performance
P1A00 on Ford vehicles indicates motor electronics coolant pump performance. Au7o has documented this code across 1 Ford model — most commonly on C-Max. This manufacturer-specific code refers to a performance problem with the motor electronics (inverter/converter) coolant pump on a hybrid or electric vehicle. The power electronics that drive the electric motor generate significant heat, and a dedicated electric coolant pump circulates coolant through them to keep them within safe temperatures. The computer monitors coolant flow and temperature, and when the pump isn't moving coolant adequately, it sets this performance code, which can lead to reduced power or limited hybrid operation to prevent overheating damage. The most common root is a weak or failed electric coolant pump, but air pockets, low coolant, or restrictions can also trigger it. Typical repair costs on Ford range from $150 to $5,000, depending on the specific model and root cause.
Common Causes of P1A00
- •Failed or weak motor electronics (inverter) coolant pump
- •Air pockets in the inverter cooling circuit (after service or leak)
- •Low coolant level from a leak in hoses or reservoir
- •Blocked or restricted coolant passages/radiator
- •Contaminated or degraded coolant reducing flow/heat transfer
- •Damaged or corroded pump wiring/connector
- •Faulty coolant temperature sensor
- •Faulty hybrid/inverter control module (rare)
P1A00 on Ford by Model
Ford C-Max(1 issue)
- Hybrid Battery Pack Degradation and "Stop Safely Now" Warning2013-2018
The C-Max hybrid battery pack (lithium-ion in Energi, NiMH in Hybrid) can exhibit cell imbalance and capacity degradation, triggering the "Stop Safely Now" warning message. This disables the hybrid system and forces the vehicle into a reduced-power limp mode. The Energi plug-in version's lithium pack generally holds up better than the base Hybrid's NiMH cells. Ford's 8-year/100,000-mile battery warranty covers most failures, but out-of-warranty replacement is costly.
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View P1A00 across all makes →Frequently Asked Questions
What does P1A00 mean on Ford?▼
P1A00 stands for "Motor Electronics Coolant Pump Performance." This manufacturer-specific code refers to a performance problem with the motor electronics (inverter/converter) coolant pump on a hybrid or electric vehicle. The power electronics that drive the electric motor generate significant heat, and a dedicated electric coolant pump circulates coolant through them to keep them within safe temperatures. The computer monitors coolant flow and temperature, and when the pump isn't moving coolant adequately, it sets this performance code, which can lead to reduced power or limited hybrid operation to prevent overheating damage. The most common root is a weak or failed electric coolant pump, but air pockets, low coolant, or restrictions can also trigger it. On Ford specifically, this code is documented across 1 model.
What causes P1A00 on Ford vehicles?▼
Common causes on Ford: Failed or weak motor electronics (inverter) coolant pump, Air pockets in the inverter cooling circuit (after service or leak), Low coolant level from a leak in hoses or reservoir, Blocked or restricted coolant passages/radiator, Contaminated or degraded coolant reducing flow/heat transfer. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1A00 on a Ford?▼
Repair costs on Ford range from $150 to $5,000, depending on the specific model and root cause.
Which Ford models have P1A00 documented?▼
Au7o has documented P1A00 on 1 Ford model: C-Max.