Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2006X5 (E53) V8-4.8L (N62)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSTRANSMISSION CONTROL SYSTEM4F9B
2006 BMW X5 (E53) V8-4.8L (N62)
4F9B
2006 BMW X5 (E53) V8-4.8L (N62)SECTION 4F9B
4F9B - P17FA
Information saved in
GS
Fault code
4F9B - P17FA
Fault text
Ratio monitoring, gearshift 3-1
Fault description
Ratio Monitoring Shift 3-1
Condition for fault identification
Test condition:
Positive torque transfer in D or R
Torque converter turbine speed >0 rpm
Engine speed >400 rpm
Terminal condition: Ignition ON
Voltage condition:
7 ... 16V
Condition for fault memory entry
Symptom counter
Action in service
If fault is passive: Check fluid level according to
specifications and add fluid as indicated. Clear fault memory
and conduct road test under monitored conditions (upshift
and downshift through all gears). If fault code is not
registered, transmission OK
If fault code is entered repeatedly Replace transmission.
Fault effect and breakdown warning
Driver information
Warning light:
E-gearshift: CC-ID420
M-gearshift: CC-ID420
Electr. default mode 3rd gear fix
Service instruction
none
Information saved in
GS
Fault code
4F9B - P17FA
Fault text
Ratio monitoring, gearshift 3-1
Fault description
Ratio Monitoring Shift 3-1
Condition for fault identification
Test condition:
Positive torque transfer in D or R
Torque converter turbine speed >0 rpm
Engine speed >400 rpm
Terminal condition: Ignition ON
Voltage condition:
7 ... 16V
Condition for fault memory entry
Symptom counter
Action in service
If fault is passive: Check fluid level according to
specifications and add fluid as indicated. Clear fault memory
and conduct road test under monitored conditions (upshift
and downshift through all gears). If fault code is not
registered, transmission OK
If fault code is entered repeatedly Replace transmission.
Fault effect and breakdown warning
Driver information
Warning light:
E-gearshift: CC-ID420
M-gearshift: CC-ID420
Electr. default mode 3rd gear fix
Service instruction
none
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.