P260F

Code

Generic P — Powertrain

EVAP System Monitoring Processor Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 23 EN: 62 RU: 29

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Internal PCM/ECU processor or memory fault
Corrupted or failed PCM software/calibration
Low or unstable battery/charging voltage during monitoring
Poor power/ground connections to PCM
Damaged or corroded wiring or connectors on PCM or CAN network
CAN bus or serial communication errors interfering with monitor routines

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
EVAP system monitor shows as NOT READY or FAILED in readiness data
Vehicle may fail emissions readiness check
Usually no immediate drivability issues related to engine performance
Freeze frame captured at time of fault

What to check

Retrieve and save all stored DTCs and freeze frame data from PCM
Check battery voltage at rest and while cranking; inspect battery terminals and cables
Scan for other related DTCs (CAN, PCM, EVAP) that may point to wiring or module faults
Visually inspect PCM connectors and wiring for corrosion, bent pins, damaged insulation or loose pins
Check chassis and engine grounds related to PCM
Check CAN bus continuity and termination; look for high error counters on scan tool

Signal parameters

PCM/ECU supply voltage (V)
PCM ground integrity / resistance (Ω)
Battery voltage during DTC set (V)
EVAP monitor status (Ready/Not Ready/Failed)
MIL on/off status
CAN bus error/frame counters

Diagnostic algorithm

Connect a capable scan tool and record all DTCs, freeze frame and readiness status
Verify battery condition and voltage (fully charged, >12.4 V at rest). Clean and tighten battery terminals if needed
Inspect PCM power and ground circuits: measure voltage and ground resistance at the PCM harness
Inspect PCM connector and wiring for damage, corrosion or water ingress; repair any issues found
Check CAN/communication network for lost frames or high error counts; repair damaged wiring or terminate issues
Look for related EVAP DTCs (leaks, sensor faults). Resolve wiring/sensor faults that could interrupt monitor routines
If wiring and power/ground are good and communications are healthy, check PCM software/calibration version. Compare to latest OEM release and reflash or reprogram if an update or corruption is suspected
Clear codes, perform required drive cycle or EVAP-specific self-tests, and monitor for recurrence
If fault persists after wiring, power, and software checks, consult OEM technical service bulletins. Consider PCM replacement only after verifying all external causes have been eliminated

Likely causes

Weak battery or poor battery terminal connection during self-test
Faulty PCM power supply or ground circuit
Corrupted ECU calibration after an update or failed flash
CAN bus wiring fault or high bus error count
Intermittent EVAP component input (e.g., purge valve) that triggers monitor routine failure

Fault status

⚠️ Status

EVAP system monitoring processor performance fault detected. MIL illuminated. EVAP monitor failed to complete; freeze frame and diagnostic data stored in PCM.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours