Q: 2004 jag xj8 4.2 v8 auto trans 5spd had trans fluid leak. lost approx 6qts. repaired leak and filled per instructions on alldata w

asked by on

5spd auto trans... had leak, lost approx. 6 qts. fixed leak and filled per instructions on alldata w/ a good scantool to observe trans temp while filling. does not go into gear... reverse or drive or manual mode. feels like reverse engages but does not go anywhere. same thing in drive. weird thing is, in park on the gas pedal, the vehicle pushes forward, same thing in neutral... like its between gears. scanned p0730 and p0736. alldata did not have diag charts. only info found is to replace trans for internal mechanical failure.

My car has 130000 miles.
My car has an automatic transmission.

The two codes, P0736 and P0730 overlap to some extent insofar as possible faults. If the transmission fluid got really low, the transmission might have overheated with several consequences: burnt fluid; mechanical damage, case/part distortion, damage to hydraulic seals on clutch pistons, and so forth. Although you added a lot of "new" fluid, check the fluid condition. You might have to remove the pan and check for debris and check for a clogged filter. Debris and a clogged filter will cause non operation. If there is debris and/or the fluid is burnt or contaminated, you’ll have to change the fluid yet again to rule that out as a cause. Of course, if you find a lot of metal debris, you might be better off just rebuilding the unit and not attempting to further diagnosis a unit that already evidences obvious damage. Check the fluid level. Check for burnt wiring, particularly to the shift solenoids, and faulty circuitry. Test the shift solenoids (check resistance of coils). If none of the foregoing generates a result check hydraulic gauge pressures against factory spec in P, D, and so forth. If gauge pressures are off (out of range), that means the oil pump might have gotten damaged (perhaps run dry?), the valve body is defective, hydraulic passages are blocked (that debris issue) and/or the heat caused damage to rubber piston seals causing pressure to bleed off. With inadequate pressure, clutches won’t apply and the car won’t go into gear.


If you desire, all of the foregoing diagnostic steps can be performed by a mobile certified mechanic. Please simply request a shift diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 2004 jag xj8 4.2 v8 auto trans 5spd had trans fluid leak. lost approx 6qts. repaired leak and filled per instructions on alldata w

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: All my gears work but drive and 3rd gear

Hello, thank you for writing in. The vehicle is likely experiencing issues with the transmission. The first step to take is having the vehicle scanned for diagnostic codes, and use them to help point you in the right direction. If...

Q: Malfunction of the tire pressure monitoring system

That is a rather complex tire pressure monitoring system used by Audi. Using multiple sensors, antennae, and control module, this may require the Audi manufacturer's scan tool to communicate with in order to diagnose. A tire service center (that is...

Q: Cannot get engine light or DSC reading to go off 2002 Jaguar X-type

Hi - there must still be a problem code which is eluding them, perhaps something Jaguar-specific. The Dynamic Stability Control (DSC) warning light may be simply a dirty or failed wheel speed sensor. I would recommend a Check Engine light...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...