Question about 2003 Jaguar X-Type

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I have a gearbox error showing on the dash and i pulled code number p0734: gear ratio error in 4th. normal accell 4th gear neutrals out and hits rev limit at 3k rpm. trans been rebuilt 3 times and valve body been replaced. any suggestions?

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  • Jaguar Master
  • 6,982 Answers

The code you are reading is a bit misleading. The gear ratio is not incorrect, the slipping in 4th gear is what the computer is seeing and reading it that way.
Unless you can find a competent shop to do your rebuild, your only other option is to have the shop you are using stop rebuilding the one you have and get you another complete unit. There could be a problem with your original, such as slight porosity in the case, permitting a pressure drop which they are not seeing. (or they are repeating the same mistake each time they rebuild it!

Posted on Apr 13, 2009

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I have a 2012 Dodge Avenger that is showing the codes P0732, P0733, P0734. The rpms go up even when not accelerating. And then it won't go into gear. When it's in Drive it's like its in Neutral.


Those codes indicate the PCM/TCM has determined an incorrect gear ratio for 2nd, 3rd, and 4th gear respectively. That's because it is comparing the signals from the input speed sensor and the output speed sensor on the transmission, and one or both of them is not providing an accurate signal. I would guess that one (or both) has failed and needs to be replaced.

Jul 30, 2017 | Dodge Cars & Trucks

2 Answers

On a 2001 Chrysler 300 what does p0 734 and mean and how do you fix them


Code P0734 more or less means transmission is slipping in 4th.
  • Defective 4th gear related shift solenoid
  • Defective 4th gear related gear set or clutch pack
  • Defective Engine Coolant Temperature Sensor
  • Defective Valve Body
  • Dirty transmission fluid that restricts the hydraulic passages
Check the attached links,
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

P0734 OBD II Trouble Code


http://www.datsc.com/tabid/122/OBD-Error-Code/P0734/Diagnostics/chrysler/Default.aspx
P0731 Gear 1 Incorrect Ratio
Transmission code P0733 without P0715

Mar 09, 2016 | Chrysler Cars & Trucks

1 Answer

P0734 Hyundai accent 2003


code p 0734 refers to gear 4--incorrect ratio===causes --wiring---TR sensor/ switch---shift solenoids---transmission mechanical fault
I would check the operation of the transmission ration sensor/switch first as that is the most likely place that the fault is
check engine lights are not solely for the engine but report on transmission problems as well
a transmission mechanical fault is the absolute last that you should consider because the transmission will revert to normal operations until it selects gear 4 which indicates sensor or solenoid problem

Apr 13, 2012 | 2003 Hyundai Accent

1 Answer

My 2000 hyundai elantra is automatic it has a code p0734. which the mechanic explained me that i have to get the speen sensor replace and get new clutch because the 4 gear ratio is bad. pls advice what 2...


P0734=A/T 4th gear incorrect ratio. This has nothing to do with the speed sensor. If the speed sensor was faulty, it would also set OTHER gear incorrect ratio codes. My experience tells me the 4th gear incorrect ration indicates the torque converter clutch (TCC) is slipping and nothing more. Unless there was a speed sensor DTC (Diagnostic Trouble Code), the sensor is not the issue (yet). The fact P0734 was set (trust the computer), the TCC is slipping (out of range). Question: Maintenance history may indicate the wrong transmission fluid may have been introduced. Hyundai's Transmission fluid is strictly SPIII... there is no substitute. The incorrect fluid will cause 4th gear slippage. Now, having said that, it doesn't mean the 4th gear (lock-up) clutch isn't worn out. Have a qualified/certified Hyundai Service Technician properly diagnose this issue.

Sep 08, 2011 | 2000 Hyundai Elantra

2 Answers

Code p0734 I just replaced eng. and trans. now have this code.


Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect transmission shifting Possible causes - Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit Tech notes Start by inspecting the transmission fluid level and condition, and change fluid if necessary. When is the code detected? P0734 is detected when A/T cannot be shifted to the 4th gear position even if electrical circuit is good. P0734 NISSAN Description This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (4th) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

Aug 09, 2011 | 1995 Nissan Altima

1 Answer

My 2000 Sephia will only shift gears manually from 1,2, then to drive. I get a code PO734. How do I fix and or slove this problem?


This is what your codes mean:

Trouble Code-P0734 (A/T Additional Gear Ratio Error In Fourth Gear)


Trouble Code Conditions:
Vehicle driven to a speed of 4-37 mph at more than 500 rpm, gear selector in 4th Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.
Possible Causes:
  • Customer may complain of intermittent 4th gear operation
  • O/D and 2/4 pressures less than 75 psi
  • O/D or 2/4 clutch volume indexes out of specification
  • O/D accumulator seals are damaged
  • Transmission enters "limp in" mode running in 4th gear

Trouble Code-P0735 (A/T Gear Ratio Error Fourth Prime)

Trouble Code Conditions:
Vehicle driven any forward Gear, and the TCM detected the ratio of the Input speed to the Output Speed did not match the current Gear Ratio (this test can take up to 5 minutes).
Possible Causes:
  • Related Gear Ratio trouble codes may be stored (note that some of these Gear Ratio trouble codes may be intermittent)
  • Transmission has internal problems or damage present
You have a transmission problem.Hope this helps, James Booth

May 17, 2011 | Kia Sephia Cars & Trucks

1 Answer

My came with a code po734 is that a big problem?


DTC P0734 - Improper Ratio for Fourth Gear.
P0734 is detected when A/T cannot be shifted to the 4th gear position even if electrical circuit is good.

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (4th) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect transmission shifting

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

Tech notes: Start by inspecting the transmission fluid level and condition, and change fluid if necessary.


Test and check it and send us ypur comments.

May 14, 2011 | 2000 Land Rover Discovery

2 Answers

Code po734, po735


This is what your codes mean:

Trouble Code-P0734 (A/T Additional Gear Ratio Error In Fourth Gear)


Trouble Code Conditions:
Vehicle driven to a speed of 4-37 mph at more than 500 rpm, gear selector in 4th Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.

Possible Causes:

  • Customer may complain of intermittent 4th gear operation
  • O/D and 2/4 pressures less than 75 psi
  • O/D or 2/4 clutch volume indexes out of specification
  • O/D accumulator seals are damaged
  • Transmission enters "limp in" mode running in 4th gear

Trouble Code-P0735 (A/T Gear Ratio Error Fourth Prime)

Trouble Code Conditions:
Vehicle driven any forward Gear, and the TCM detected the ratio of the Input speed to the Output Speed did not match the current Gear Ratio (this test can take up to 5 minutes).

Possible Causes:

  • Related Gear Ratio trouble codes may be stored (note that some of these Gear Ratio trouble codes may be intermittent)
  • Transmission has internal problems or damage present
You have a transmission problem.

Jan 17, 2011 | 2003 Dodge Durango

1 Answer

Transmission Problem - Ford Escape 2006


P0732 and P0734 indicates gear ratio errors in 2nd and 4th gears, basically no 2nd and 4th gear. The one thing 2nd and 4th gear has in common is the band, the band is known to break, this is a common failure with this transmission and happens on a regular basis.

You need to remove the transmission to repair it.

Jan 25, 2010 | 2006 Ford Escape

1 Answer

Chrysler Neon auto gearbox problems


P0733 IS GEAR RATIO ERROR IN 3RD AND P0734 IS GEAR RATIO ERROR IN 4TH..THESE CODES USUALLY MEAN AN INTERNAL PROBLEM IN TRANSMISSION,BUT CHECK WIRES AT SPEED SENSOR CONNECTORS FOR BROKEN WIRES BY PULLING ON WIRES AND WIRING NEAR SOLENOID PACK FOR CHAFING..I HOPE THIS HELPS..YOU MIGHT WANT TO DROP THE TRANS PAN AND LOOK FOR A PLUGGED FILTER OR DEBRIS IN PAN..MAKE SURE THE TRANS COOLER IN RAD HAS NOT FAILED ALSO

Aug 14, 2009 | Chrysler Neon Cars & Trucks

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