2026 Mercedes-Benz CLA 250

Complaint At low A/C loads and low blower setting (min. to 2), loud hissing noises can be clearly heard from the area of the air conditioner box (particularly when the vehicle is stationary). Cause Discharge noises at the evaporator expansion valve which are transmitted into the interior compartment. Remedy Change in position of evaporator expansion valve Work instructions: Fabricate an adapter wiring harness as described below Parts required for modifying chiller valve module: A1748308402 evaporator A1748308502 refrigerant line A1748308602 refrigerant line A1748308902 refrigerant line A1748300003 expansion value A0239976345 profile sealing ring A0239976545 profile sealing ring A2478304602 mounting plate incl. installation material Work procedure 1. Prepare vehicle 1. Remove frunk as per WIS instructions AR88.40‑P‑1102CLA. 2. Remove old components 1. Remove evaporator as per WIS instructions AR83.30‑P‑5543CLA. 2. Remove following refrigerant line: a. A1748300002 b. A1748301702 c. A1748302002 d. A1748302402 3. Remove expansion valve as per WIS instructions AR83.30‑P‑5520CLA. 3. Install new components 1. Install HVAC adapter (A1748300003) using previously removed screws. (Installation material of mounting plate is not required) 2. Install new A/C lines as well as new evaporator (A1748308402). 3. Install adapter wiring harness XXX. 4. Secure adapter wiring harness using mounting plate. 4. Concluding work 1. Install/enter equipment code S18 on data card of vehicle. 2. Perform Xentry quick test and erase fault memory 3. Check vehicle to ensure that air conditioning system is functioning correctly.

Complaint Slight creaking noises when steering. Cause Noises may come from one or more sleeves of the horn contact plate. Remedy Remove the horn contact plate and check the sleeves for noise; see attached video. If necessary, apply lubricant to the sleeves.

Complaint Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is similar to a tire or wheel vibration, it is usually readily noticeable that it is distinctly different if it happens at all times or only while braking. Cause Although the cause of the vibration is most likely due to excessive lateral runout on the rotor or hub/wheel bearing, the system as a whole needs to be checked for other possible contributors. 1. Prior collision damage. 2. Excessive vehicle sitting times without rotating components. 3. Wheel bearing/hub lateral runout. 4. Wheel mating interface has been overtightened (did not follow WIS torque procedures). 5. Mating interfaces have been excessively modified (painted, gouged, bent, etc...). Remedy Read through the entire attached worksheet prior to performing. After performing, please review the final page and perform work accordingly. NOTE: This document is not pre‑authorization or otherwise dealing with warranty. This is intended for diagnostic purposes only. If there are any questions on how to proceed OR The work sheet has been performed and the vehicle has returned with the same concern. Please perform the measurements as seen in the worksheet again and open a TIPS case to the Body, Chassis, and Entertainment team.

Complaint Radio station cover art does not refresh when switching stations. The UI continues to show the old station’s artwork instead of updating to the new one. Cause When a new station change request is triggered, a temporary glitch is causing the Head Unit application to fail to overwrite the previous request. This glitch is causing the cover art mismatch in the Radio application. Remedy Please do not replace any parts. Please update the Head unit software to E505.9

Complaint Clanking noise from the area of the speakers in the doors. Cause Under analysis. Remedy To narrow down the cause, first of all remove the door trim. • If the noise continues to occur even with the door trim removed, then continue the diagnosis working towards the speaker and if necessary, create a TIPS case with an informative video as an attachment. Note: Please refer to this document in the warranty claim and, once diagnosis is completed, select the damage code depending on the component part that is causing the issue. • If the noise stops when the door trim is removed, please proceed in accordance with LI72.10‑P‑067691. Information: In this case, do not use a damage code for the speakers in the warranty claim!

Complaint Temporary no start condition with check engine light and multiple warning messages. When performing a quick test, the following fault code is stored in Y3/14 ‑ Transmission control for 8‑speed dual‑clutch transmission (DKG): P24F100 The wake‑up line of the control unit has a short circuit to positive. Cause Possible signal timing between EZS control unit and Transmission Control Unit (DKG) Remedy As of 7/15/2026, new SCN coding is available for the EZS control unit. IPR will advise to open a TIPS case for EZS (N73), this is due to GLA models requiring support for SCN coding procedure. GLB (X247) and CLA (118) No TIPS case necessary. 1. SCN coding of EZS Control Unit 2. Clear all faults and perform extended road test with multiple drive cycles GLA (H247) Special function password required. 1. Verify if special procedure Central Locking ‑ Development Data is present in EZS (figure 1) 2. Submit a TIPS case to the Powertrain Inbox with the following information: ‑ Initial Quick Test w/ freeze frame data ‑ IPR Result ‑ DKG Control Unit Log ‑ EZS Control Unit Log ‑ Initial EEPROM data ‑ EZS special procedure menu If the vehicle has had this LI performed and P24F100 has returned, please submit a TIPS case to the Powertrain Inbox.