What Does P064E Mean?
The ECM's internal processor responsible for processing oxygen sensor signals on Bank 2 is not performing within specifications. This is the Bank 2 counterpart to P064D — the ECM's O2 sensor processing circuitry for the second bank of cylinders has degraded. The driver may notice poor fuel economy, rough running, or failed emissions, and if both P064D and P064E are present, ECM replacement is almost certain.
Common Causes
40%
ECM internal processor degradation or failure (Bank 2 O2 sensor processing circuit)
25%
ECM software corruption requiring reflash/reprogramming
15%
Intermittent power or ground fault causing ECM processor errors
10%
O2 sensor signal wire interference (EMI from aftermarket electronics) affecting Bank 2 processor input
10%
ECM connector corrosion causing intermittent signal degradation at Bank 2 processor inputs
Diagnostic Steps
1
Check for P064D (Bank 1 counterpart) and any O2 sensor codes (P0150-P0167). If both banks are affected, the ECM processor failure is widespread. Compare Bank 2 fuel trims — erratic or pegged trims confirm the issue.
2
Inspect all ECM connectors for corrosion, water intrusion, bent or pushed-back pins. Check ECM power supply and ground integrity with a multimeter.
3
Monitor Bank 2 O2 sensor waveforms with a scan tool or oscilloscope. Normal upstream sensor switching (0.1-0.9V, crossing 0.45V multiple times per second) with abnormal fuel trims points to an ECM processor fault.
4
Attempt an ECM software reflash/reprogramming to the latest calibration. Check for any applicable TSBs related to internal processor performance codes.
5
If reflash does not resolve the code, the ECM requires replacement and programming. On vehicles with both P064D and P064E, ECM replacement is almost always required.
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The ECM's internal processor responsible for processing oxygen sensor signals on Bank 2 is not performing within specifications. This is the Bank 2 counterpart to P064D — the ECM's O2 sensor processing circuitry for the second bank of cylinders has degraded. The driver may notice poor fuel economy, ...
The most common cause of P064E (Internal Control Module O2 Sensor Processor Performance Bank 2) is: ECM internal processor degradation or failure (Bank 2 O2 sensor processing circuit)
Typical repair costs for P064E range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle can be driven but may run rich or lean on Bank 2, leading to increased emissions and potential catalytic converter damage. If both P064D and P064E are present, the condition is more severe. Have it repaired soon to avoid expensive secondary damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P064E to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Control Module / Fuel System
Difficulty
Type
Generic (SAE)
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