Reductant Heater 'A' Control Performance
The POWERSTROKE-P20BA (Power Stroke) diesel fault code means: Reductant Heater 'A' Control Performance. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- intermediate
- Estimated cost
- $300-$1,400
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Common Symptoms
- DEF warning / countdown
- CEL
- Possible derate
Probable Causes (Ranked by Likelihood)
- Failed DEF tank heater Very Likely
- Failed DEF heater relay Likely
- Frozen DEF blocking heater feedback Possible
Common Fixes by Vehicle
What techs usually find when diagnosing POWERSTROKE-P20BA on specific platforms — tap a platform for the fix and the exact part:
2011-2019 Ford F-250/F-350 6.7L Power Stroke Moderate DIY
DEF pressure too high - pump commanded off but still building pressure. Usually a stuck-closed DEF injector (doser) or a pinched/frozen DEF line between pump and doser. Inspect lines for kinks first, then test the doser for free flow.
Labor: 1.0 hrFrequently Asked Questions
What is P20BA on a 6.7L Power Stroke (Scorpion)?
P20BA on a 6.7L Power Stroke (Scorpion) (2011-present) indicates: Reductant Heater 'A' Control Performance. This is a known diagnostic trouble code on this engine family and typically points to the causes listed above.
Can I drive with P20BA on my Power Stroke?
Only drive short distances to get to a repair facility. Continued operation may cause further damage.
How much does it cost to fix P20BA?
Repair cost is typically $300-$1,400 depending on the underlying cause and whether you DIY or use a shop. Diagnostic time alone runs $100-$180 at most independent diesel shops.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
Check DEF heater resistance (spec varies by year).
Inspect heater relay and wiring to tank.
In cold climates, ensure DEF is not frozen solid.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P20BA as a generic OBD-II code)
P20BA on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
Commonly Affected Vehicles
- 2011-present Ford F-250 Super Duty 6.7L Power Stroke
- 2011-present Ford F-350 Super Duty 6.7L Power Stroke
- 2011-present Ford F-450/F-550 Super Duty 6.7L Power Stroke
- 2015-2019 Ford F-650/F-750 6.7L Power Stroke
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