2021-2022 Hyundai Transaxle Solenoid DTCs P074100-P270900

Hyundai has issued Technical Service Bulletin (TSB) 22-AT-005H to address issues with automatic transaxle solenoid diagnostic trouble codes (DTCs) that can illuminate the "Check Engine" light. This bulletin, which supersedes TSB 20-AT-005H-1, provides a comprehensive repair procedure for various Hyundai models from 2021-2022 experiencing these specific transmission-related faults. If you own a 2021-2022 Hyundai Tucson experiencing a transaxle solenoid DTC, this information is crucial.

Symptoms of Automatic Transaxle Solenoid DTCs

Owners of affected vehicles will typically notice a "Check Engine" light illuminated on their dashboard. This warning light indicates that the vehicle's powertrain control module (PCM) or transmission control unit (TCU) has detected a fault within the automatic transaxle system, specifically related to the solenoids.

Affected Fault Codes (DTCs)

TSB 22-AT-005H specifically covers a range of automatic transaxle solenoid DTCs. These codes indicate various issues with the torque converter clutch and shift solenoids within the transmission.

DTC	Part / Description
P074100	Torque converter clutch system
P074300	Torque converter clutch circuit
P074800	Pressure control solenoid (PC)
P075300	Shift solenoid A (UD)
P075800	Shift solenoid B (46)
P076300	Shift solenoid C (37R)
P076800	Shift solenoid D (OD&LR)
P077300	Shift solenoid E (28)
P270900	Shift solenoid F (SSA)

Diagnosis and Trigger Conditions

When a "Check Engine" light appears with one of the listed DTCs, technicians will use a Global Diagnostic System (GDS) tool. The diagnostic process involves:

1. DTC Analysis: Recording and deleting the DTCs to see if they reappear.
2. Data Analysis: Monitoring solenoid parameters via the GDS. If solenoids show continuous and changing output while driving, the wiring is likely fine, and the issue points to the solenoid itself. If there's no continuous output, a wiring inspection is necessary.
3. Wiring Inspection: A visual check of the wiring harness between the PCM/TCU and the transmission for any damage, open/short circuits, or improperly seated pins. If damage is found, the harness is repaired or replaced.

Repair Procedure Summary

The repair procedure outlined in TSB 22-AT-005H involves replacing the faulty transaxle solenoid and potentially the valve body internal harness. This is a multi-step process that requires specialized tools and expertise.

1. Preparation: Disconnect the battery and remove the battery tray.
2. Access Transmission: Lift the vehicle, remove the undercover, and drain the Automatic Transmission Fluid (ATF).
3. Disassembly: Remove the transmission oil pan (using a rubber hammer if needed) and disconnect the internal harness and detent spring.
4. Valve Body Removal: Remove the valve body, ensuring it is placed on a clean surface to prevent contamination.
5. Solenoid and Harness Replacement:
   • Disconnect the old harness from the input speed sensor and install a new valve body internal harness (Part Number 46307-4G***).
   • Record the 8-digit code from the solenoid being replaced.
   • Replace the specific solenoid corresponding to the diagnosed DTC. Different solenoids (e.g., 28, 46, 37R, UD, OD&LR vs. SSA, TC, PC) have slightly different removal and installation steps involving supports and bolts.
6. Reassembly:
   • Install the valve body, aligning the manual shaft. Torque bolts to 7-9 lb.ft (1.0-1.2 kgf.m/10-12 N.m).
   • Reinstall the detent spring, torquing to 8-11 lb.ft (1.2-1.5 kgf.m/10-13 N.m).
   • Reconnect the harness to the solenoids and install the temperature sensor, torquing bolts to 7-9 lb.ft (1.0-1.2 kgf.m/10-12 N.m).
   • Install a new plastic oil pan gasket (Part Number 45283-4G***) and reinstall the oil pan, torquing bolts to 8-10 lb.ft (1.2-1.4 kgf.m/12-13 N.m).
   • Reinstall the lower radiator hose and refill the radiator with ethylene glycol engine coolant.
7. Fluid Refill: Add 5-6 quarts of SP4-M ATF through the transaxle fill plug. Check the fluid level with the engine running and the shift lever in "P" when the ATF temperature is 122-140°F (50-60°C).
8. GDS Programming: For specific solenoids (UD, 37R, OD&LR, 28, and 46), perform the "Solenoid Oil Pressure Data Characteristics Input" procedure using the GDS. This involves inputting the 8-digit code from the new solenoid.
9. Final Test: Clear DTCs and test drive the vehicle for two key-on/key-off driving cycles, including various upshifts and downshifts, to confirm proper transmission operation and ensure no DTCs return. This confirms the repair for the Hyundai Tucson transaxle solenoid DTC.

Required Parts

The TSB specifies various parts depending on the specific DTC. Technicians should refer to the Parts Information table and the PNC (Part Number Code) in the parts catalog to order the correct solenoid part number.

Model	DTC	Part	PNC	Part Number
2018~19 Sonata (LFa) 2.0T	P074100	Torque converter clutch system	46202A	46313-3B***
	P074300	Torque converter clutch circuit	46202A	46313-3B***
2020~Sonata (DN8) 1.6T/2.5L	P074800	Pressure control solenoid (PC)	46313A	46313-3B***
2019~ Santa Fe (TMa) 2.0T/2.4L	P075300	Shift solenoid A (UD)	46313B	46313-4G***
2020~ Palisade (LX2) 3.8L	P075800	Shift solenoid B (46)	46313C	46313-4G***
2022~ Santa Cruz (NXT) 2.5L	P076300	Shift solenoid C (37R)	46313C	46313-4G***
2022~ Tucson (NX4/NX4a) 2.5L	P076800	Shift solenoid D (OD&LR)	46313B	46313-3B***
	P077300	Shift solenoid E (28)	46313C	46313-4G***
	P270900	Shift control solenoid valve F (SSA)	46313D	46313-3B***
ALL		Valve body internal harness	46307	46307-4G***
		Plastic oil pan gasket	45282E	45283-4G***

Warranty Information

This repair is typically covered under Hyundai's normal warranty. The specific operation codes for warranty claims are 45775R00, 45775R8M, 45775R8L, and 45775RQ0. The causal part is identified as 13A, with cause code ZZ3.

Important Warnings

• Valve Body Handling: When removing the valve body, place it on a clean paper towel. Placing it on a rag may introduce lint, which can contaminate the valve body.
• Solenoid Oil Pressure Data Characteristics Input: This specific GDS procedure is only required for UD, 37R, OD&LR, 28, and 46 solenoids after replacement.

Source: NHTSA ID: 10211671, TSB #: 22-AT-005H