Infiniti G37 RE7R01A chassis codes set - Transmission Digest

Infiniti G37 RE7R01A chassis codes set

The complaint

A 2013 Infiniti G37 equipped with the RE7R01A transmission and the EXT13C transfer case has a complaint of trouble codes C1204 “4WD Solenoid Malfunction” and C1105 “Right Rear Wheel Speed Sensor Fault” stored. Due to extensive damage, the transfer case was replaced, which did not eliminate the stored codes. The shop then replaced the TCM, but the codes remained. Wiring was checked and was found to be in good condition.

The cause

The technician was about to perform some pinpoint checks when he noticed the right rear tire appeared smaller than the other three tires mounted on the vehicle. The right rear tire was a 225x55x17 size, while the other three tires were 225x65x17 in. size—refer to figure 1, above. The second pair of digits in the tire size represent the tires aspect ratio which is the width of the sidewall, which affects the tires total circumference.

This means that the 225x55x17 tire has a total circumference of 84.02 inches, while the 225x65x17 tire has a total circumference of 89.58 inches. This is a difference of 5.56 inches of total tire circumference, as seen in figure 2. This is enough of a difference in tire size to cause the trouble codes to set, when in fact there was no problem with the related components.

Figure 2.

The correction

We have learned from experience that more than ¼-in. of total tire circumference can cause operational issues with “active” transfer cases and differentials. Therefore, changing the right rear tire to a 225x65x17 size allowed the trouble codes to clear, resulting in proper operation of the vehicle. This is why it is best to use a stagger gauge when trying to determine if a tire size difference is causing a complaint.

Service information

A good website to use to determine the result of tire size differences is the tire size calculator at Tacoma World. It displays complete tire dimensions as well as the difference in speedometer readings for a particular tire size.

Read more articles in our Transmission Tech/Talk series here.

You May Also Like

Ford 8F35 maintenance tips: Planetary failure and no-pressure conditions

Our shop has had several vehicles come in with the Ford 8F35 transmission having planetary failure. Apparently, there was a run where the pinion needle bearings had a hardness problem (see Figure 1). Ford has a bulletin out (bulletin number 22-281), which provides a part number for this planetary assembly: the part number is JM5Z-7N473-C and

Figure 12.

Our shop has had several vehicles come in with the Ford 8F35 transmission having planetary failure. Apparently, there was a run where the pinion needle bearings had a hardness problem (see Figure 1).

Ford has a bulletin out (bulletin number 22-281), which provides a part number for this planetary assembly: the part number is JM5Z-7N473-C and costs about $160.

Jatco JF613E transmission quick reference material

For those working on the Jatco JR613E transmission, a widespread transmission with plenty of applications, the following should be a helpful guide. Related Articles – Back with force: ATSG is back in full swing to educate the transmission industry – Don’t fear customer complaints about CVTs – 2024 State of the Powertrain Industry Domestic and

Looking for the cause of repeated 6T40 torque converter failure

The converter clutch was applied just enough to drag but not enough to kill the engine.

Tech-Talk-Q4-Figure-4-1400
6T40 delayed engagements after overhaul

The problem lies in the compensator piston that a generation two clutch housing uses compared to the generation one housing.

Tech-Talk-Q4-Figure-7-1400
GM 6T70/75 slips and delays in first

A 2015 Chevrolet Equinox equipped with the 3.6-liter engine and 6T75 transmission has complaints of a delayed engagement into drive and slips in first gear.

Tech-Talk-Q4-Figure-11-1400

Other Posts

Shift Pointers: A Chrysler 300 no-shift complaint

The case study has to do with a 2009 Chrysler 300 C 5.7L Nag1 RWD with 71,923 miles on it (see Figure 1, above). Related Articles – Powertrain industry directory and buyer’s guide 2024 – A guide to common GM, Ford and Nissan programming issues – Shift of the shaft: Diagnosing Chrysler 48RE manual shaft

A guide to common GM, Ford and Nissan programming issues

One of the most common complaints I hear from shops when trying to install a new GM TCM is, “The module will not communicate.” While that might be partially true, by design they won’t communicate until they are programmed. If programming fails, there will be an “E” code set which will help you get to

Shift of the shaft: Diagnosing Chrysler 48RE manual shaft issues

The TorqueFlite transmission has been around since mid-to-late 1950s. There have been many changes surrounding the manual shaft and rooster comb through the years. This transmission shaft controls the position of the manual valve that directs oil for the gear ranges, but it also is used for a Reverse light control as well as Park/Neutral

Sometimes, a diagnostic code is all you need

With ATSG having the opportunity to help shops solve problems, sometimes we get faced with some real doozies. A shop will call and give us a laundry list of DTCs, leaving us to think someone must have a bulkhead connector unplugged. We then go through the arduous task of deciding which codes prompted other codes