D112 Range Detent Diagnostic
TSB-26-001-DDC

Creation Date: 2025-09-09

Engine or Vehicle Affected:
»DT12

Description of Revisions:
- 09/09/2025 — Initial release
- 04/03/2026 — Added figure reference for Detent Types.
- 04/17/2026 — Metadata update.
General Information
Some DT12 shifting complaints may be corrected by installing the updated Range Detents.

Complaint may be described as:

The transmission shifts into neutral when attempting a range up or down shift (complaint may be a 5
to 7 shift, 6 to 8 shift or any other shift combination where a low-to-high range is required).
Agrinding noise.

Parts Table

Table 1, Parts Table
Part Number Part Description Quantity

A9602670874 Split Detent 2

Table 1, Parts Table
Repair Procedure
1. Obtain a driving log file of the vehicle going through all the gears.

w Note: The CPC5 SPN 521063/14 fault code (active or inactive) may also
be present in the log.

2. Navigate to the ‘Identification’ screen, under ‘Stored Data’. Look in ‘TCM 22-22-21’ for reversing events (events counter is usually
greater than 30 and as high as 700). See 1, and chart the log file to identify range ‘hang-up/intermediate’ position. See 2. Does the
events counter read 0 or does the chart show the range in an intermediate position?
ED) idenification @ vx Segre OC20-0013 A
om Tenures OF12-0T12 OC

Commen Studard Audit Tat Compute Configaation Engine Totals NOx Biening Ratiag Stowd Date
Number of urentended dniplacemert m igit sowton Hy speed based 0

Number of urentended dnigacemert 1m git s0ubon 0. speed Dated °

b | Number of ratting events on range group shvts to Hi positon jo

tt pe FOU posto 2

| Number of heakages in range Lo podition

o
To
Number of cotetag dogs ments tucge He at vetede saradstil °
Number of colading dogs everts reege Lo at vehie Handi le

°

Number of stictong events.n range Hi at vehicle movement

Sia este cmeeuoke Se ae te
Jorn cf erage frce on tinge group shits © He postion 350K0N
[seam ef erage tree cn nnge greup die Lo postion [nase
fom gf Grp se [ozo
Sum of nanmum force onrange group shf> to Lo pation [vnzscse Nn
Number of sclencad valve sctvators range asm
| Number of sckencad valve sctwators range Lo Trae
Franses apa poopie aad eater ee e
Number of range group shifts 99 Lom/o suffcent ir 220py ro)
Overall number of eange gesup thie to HE pectin Thaw
Overal rember o! range goup shits to Lo pouson T1034

6500414

Fig. 1, Range Reversing Events

nme | AINA ENE
ia ty TLL

the |
WEEE aE

Wo1790 Wns Terao Torr! TO1sTrCMOsT THIRIS
10:16:55.331 |2309 Range actuator Actual ponition: Bange group actuator position Time Wi
2309 Runge actuator Actual powbor: Range group actuator positior [Vatue: intermesiate position @ 10:18:01.720 intermedia: posit:

<
& View Selection bef Extract Selection &, Zoom in Zoom Out & View All HM Re-tie Gj at Fut [MP Labels 125 Data Poines

Ocxcription Device Velue Unit Mur(Quserved Max(Otecrved) Min Max

12309 Fange actaator Actual position R._TOMOST inhemmediate posiben

500415

A. TCM5 2313 Desired Gear from CAN D. TCM5 2306 Split Actuator Actual
B. TCM5 1F1B Gear Information Actual Position
Gear E. TCM5 2309 Range Actuator Actual

C. CPC5 AS: Actual Engine Speed Position
Fig. 2, Monitored Instruments

a. Yes; see and continue trouble shooting.
b. No; go to step 3.

3. Remove and inspect the detents. See . Is the detent type with the red X installed (see Fig. 3)?

VT

Fig. 3, Detent Types

260435

a. Yes; replace both detents and go to step 4.
b. No; reinstall the equipped detents and go to step 4. See .
4. Remove the range piston cylinder. see .

5. After removing the range piston cylinder, actuate the range piston by repeatedly pulling and pushing on the piston (by hand) to
confirm that the detents are seated on the rod. The rod should not move freely or easily when pulling and pushing the range piston
by hand. Does the range piston rod move freely?

a. Yes; replace the transmission. See .
b. No; see to continue trouble shooting.

Warranty
Normal in-warranty procedures apply.

NOTE:

Component Code / VMRS = 026-010-093 - CATCH BOLT - DETENT, SHIFT
Component Code / VMRS = 026-015-002 - ASSEMBLY - COMPLETE, AUTOMATED
TRANSMISSION

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Document Number: 0000202497
Topic Publication Date: 2026-04-16