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Mount Vernon, WA | I'm guessing it's actually flash code 25, which would be a problem with the boost sensor and/or circuit. This should cause low power since the ECM does not know what the actual boost is, and will limit fueling until it does.
Below are the flash codes for a 3406C engine. (4CK prefix).
System Diagnostic Code
Diagnostic Code Description
01 Idle Shutdown Timer
12 Coolant Level Sensor Fault
21 Sensor Supply Voltage Fault
22 Rack Position Sensor Fault
23 Timing Position Sensor Fault
24 Oil Pressure Sensor Fault
25 Boost Pressure Sensor Fault
27 Coolant Temperature Sensor Fault
28 Check Throttle Sensor Adjustment
31 Loss of Vehicle Speed Signal
32 Throttle Position Sensor Signal Fault
33 Engine RPM Signal Fault
34 Loss of Engine Speed Signal
35 Engine Overspeed Warning
36 Vehicle Speed Signal Fault
41 Vehicle Overspeed Warning
42 Check Sensor Calibration
43 Rack Subsystem Fault
44 Timing Subsystem Fault
45 Shutoff Solenoid Fault
46 Low Oil Pressure Warning
47 Idle Shutdown Occurrence
48 Excessive Engine Power
51 Intermittent Battery Power to ECM
52 ECM or Personality Module Fault
53 ECM Fault
55 No Detected Faults
56 Check Customer Parameters or System Parameters
58 Powertrain Data Link Fault
61 High Coolant Temperature Warning
62 Low Coolant Level Warning
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code 20-05 on Cat 3406 c peec enigne
